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extract expected return type for async fn generators #64999

Merged
merged 16 commits into from
Oct 3, 2019
Merged

extract expected return type for async fn generators #64999

merged 16 commits into from
Oct 3, 2019

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nikomatsakis
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Fixes #60424

cc @Centril, I know you've been eager to see this fixed.

r? @cramertj

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 2, 2019
@nikomatsakis nikomatsakis mentioned this pull request Oct 2, 2019
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Centril
Centril reviewed Oct 2, 2019
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@Centril
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Centril commented Oct 2, 2019

r=me if you like with comments addressed.

@Centril Centril added beta-nominated Nominated for backporting to the compiler in the beta channel. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 2, 2019
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The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log. 
2019-10-02T16:33:43.0236797Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-10-02T16:33:43.0431505Z ##[command]git config gc.auto 0
2019-10-02T16:33:43.0484444Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-10-02T16:33:43.0536619Z ##[command]git config --get-all http.proxy
2019-10-02T16:33:43.0655444Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/64999/merge:refs/remotes/pull/64999/merge
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---
2019-10-02T17:39:57.9402733Z 41 
2019-10-02T17:39:57.9402771Z + error[E0308]: mismatched types
2019-10-02T17:39:57.9403518Z +   --> $DIR/async-block-control-flow-static-semantics.rs:22:58
2019-10-02T17:39:57.9403576Z +    |
2019-10-02T17:39:57.9404181Z + LL |   async fn return_targets_async_block_not_async_fn() -> u8 {
2019-10-02T17:39:57.9404303Z + LL | |
2019-10-02T17:39:57.9404303Z + LL | |
2019-10-02T17:39:57.9404339Z + LL | |     let block = async {
2019-10-02T17:39:57.9404394Z + LL | |         return 0u8;
2019-10-02T17:39:57.9404429Z + ...  |
2019-10-02T17:39:57.9404464Z + LL | |
2019-10-02T17:39:57.9404703Z + LL | | }
2019-10-02T17:39:57.9404763Z +    | |_^ expected u8, found ()
2019-10-02T17:39:57.9404836Z +    = note: expected type `u8`
2019-10-02T17:39:57.9404892Z +               found type `()`
2019-10-02T17:39:57.9405108Z + 
2019-10-02T17:39:57.9405108Z + 
2019-10-02T17:39:57.9405152Z 42 error[E0271]: type mismatch resolving `<impl std::future::Future as std::future::Future>::Output == ()`
2019-10-02T17:39:57.9405675Z 44    |
2019-10-02T17:39:57.9405697Z 
2019-10-02T17:39:57.9405731Z 48    = note: expected type `u8`
2019-10-02T17:39:57.9405795Z 49               found type `()`
2019-10-02T17:39:57.9405795Z 49               found type `()`
2019-10-02T17:39:57.9405839Z 50    = note: required for the cast to the object type `dyn std::future::Future<Output = ()>`
2019-10-02T17:39:57.9406889Z - 
2019-10-02T17:39:57.9407519Z - error[E0271]: type mismatch resolving `<impl std::future::Future as std::future::Future>::Output == u8`
2019-10-02T17:39:57.9408247Z -    |
2019-10-02T17:39:57.9408247Z -    |
2019-10-02T17:39:57.9408519Z - LL | async fn return_targets_async_block_not_async_fn() -> u8 {
2019-10-02T17:39:57.9409050Z -    |                                                       ^^ expected (), found u8
2019-10-02T17:39:57.9442575Z -    = note: expected type `()`
2019-10-02T17:39:57.9442818Z -               found type `u8`
2019-10-02T17:39:57.9442818Z -               found type `u8`
2019-10-02T17:39:57.9443188Z -    = note: the return type of a function must have a statically known size
2019-10-02T17:39:57.9443302Z 62 error[E0308]: mismatched types
2019-10-02T17:39:57.9443505Z 63   --> $DIR/async-block-control-flow-static-semantics.rs:48:44
2019-10-02T17:39:57.9443536Z 
2019-10-02T17:39:57.9443559Z 
2019-10-02T17:39:57.9443559Z 
2019-10-02T17:39:57.9443617Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9443917Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/async-block-control-flow-static-semantics/async-block-control-flow-static-semantics.stderr
2019-10-02T17:39:57.9444306Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9444573Z To only update this specific test, also pass `--test-args async-await/async-block-control-flow-static-semantics.rs`
2019-10-02T17:39:57.9444809Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9445026Z status: exit code: 1
2019-10-02T17:39:57.9445026Z status: exit code: 1
2019-10-02T17:39:57.9446187Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/async-await/async-block-control-flow-static-semantics.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/async-block-control-flow-static-semantics" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/async-block-control-flow-static-semantics/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9446960Z ------------------------------------------
2019-10-02T17:39:57.9447013Z 
2019-10-02T17:39:57.9447269Z ------------------------------------------
2019-10-02T17:39:57.9447318Z stderr:
2019-10-02T17:39:57.9447318Z stderr:
2019-10-02T17:39:57.9447532Z ------------------------------------------
2019-10-02T17:39:57.9447603Z error[E0267]: `break` inside of an `async` block
2019-10-02T17:39:57.9447939Z    |
2019-10-02T17:39:57.9448005Z LL |       async {
2019-10-02T17:39:57.9448207Z    |  ___________-
2019-10-02T17:39:57.9448207Z    |  ___________-
2019-10-02T17:39:57.9448262Z LL | |         break 0u8; //~ ERROR `break` inside of an `async` block
2019-10-02T17:39:57.9448335Z    | |         ^^^^^^^^^ cannot `break` inside of an `async` block
2019-10-02T17:39:57.9448384Z LL | |     };
2019-10-02T17:39:57.9448597Z    | |_____- enclosing `async` block
2019-10-02T17:39:57.9448631Z 
2019-10-02T17:39:57.9455128Z error[E0267]: `break` inside of an `async` block
2019-10-02T17:39:57.9455565Z    |
2019-10-02T17:39:57.9455622Z LL |           async {
2019-10-02T17:39:57.9455788Z    |  _______________-
2019-10-02T17:39:57.9455788Z    |  _______________-
2019-10-02T17:39:57.9455831Z LL | |             break 0u8; //~ ERROR `break` inside of an `async` block
2019-10-02T17:39:57.9455898Z    | |             ^^^^^^^^^ cannot `break` inside of an `async` block
2019-10-02T17:39:57.9455938Z LL | |         };
2019-10-02T17:39:57.9456653Z    | |_________- enclosing `async` block
2019-10-02T17:39:57.9456771Z error[E0308]: mismatched types
2019-10-02T17:39:57.9457094Z   --> /checkout/src/test/ui/async-await/async-block-control-flow-static-semantics.rs:13:43
2019-10-02T17:39:57.9457147Z    |
2019-10-02T17:39:57.9457147Z    |
2019-10-02T17:39:57.9457394Z LL | fn return_targets_async_block_not_fn() -> u8 {
2019-10-02T17:39:57.9457649Z    |    ---------------------------------      ^^ expected u8, found ()
2019-10-02T17:39:57.9457701Z    |    |
2019-10-02T17:39:57.9457772Z    |    implicitly returns `()` as its body has no tail or `return` expression
2019-10-02T17:39:57.9457888Z    = note: expected type `u8`
2019-10-02T17:39:57.9457936Z               found type `()`
2019-10-02T17:39:57.9457985Z 
2019-10-02T17:39:57.9457985Z 
2019-10-02T17:39:57.9458041Z error[E0271]: type mismatch resolving `<impl std::future::Future as std::future::Future>::Output == ()`
2019-10-02T17:39:57.9458451Z    |
2019-10-02T17:39:57.9458451Z    |
2019-10-02T17:39:57.9458502Z LL |     let _: &dyn Future<Output = ()> = &block;
2019-10-02T17:39:57.9458558Z    |                                       ^^^^^^ expected u8, found ()
2019-10-02T17:39:57.9458674Z    = note: expected type `u8`
2019-10-02T17:39:57.9458723Z               found type `()`
2019-10-02T17:39:57.9458779Z    = note: required for the cast to the object type `dyn std::future::Future<Output = ()>`
2019-10-02T17:39:57.9458835Z 
2019-10-02T17:39:57.9458835Z 
2019-10-02T17:39:57.9459064Z error[E0308]: mismatched types
2019-10-02T17:39:57.9459402Z   --> /checkout/src/test/ui/async-await/async-block-control-flow-static-semantics.rs:22:58
2019-10-02T17:39:57.9459478Z    |
2019-10-02T17:39:57.9459745Z LL |   async fn return_targets_async_block_not_async_fn() -> u8 {
2019-10-02T17:39:57.9460055Z    |  __________________________________________________________^
2019-10-02T17:39:57.9460297Z LL | |     //~^ ERROR type mismatch resolving
2019-10-02T17:39:57.9460334Z LL | |     let block = async {
2019-10-02T17:39:57.9460370Z LL | |         return 0u8;
2019-10-02T17:39:57.9460405Z ...  |
2019-10-02T17:39:57.9460465Z LL | |     //~^ ERROR type mismatch resolving `<impl std::future::Future as std::future::Future>::Output == ()`
2019-10-02T17:39:57.9460505Z LL | | }
2019-10-02T17:39:57.9460540Z    | |_^ expected u8, found ()
2019-10-02T17:39:57.9460629Z    = note: expected type `u8`
2019-10-02T17:39:57.9460664Z               found type `()`
2019-10-02T17:39:57.9460694Z 
2019-10-02T17:39:57.9460694Z 
2019-10-02T17:39:57.9460752Z error[E0271]: type mismatch resolving `<impl std::future::Future as std::future::Future>::Output == ()`
2019-10-02T17:39:57.9461042Z    |
2019-10-02T17:39:57.9461042Z    |
2019-10-02T17:39:57.9461104Z LL |     let _: &dyn Future<Output = ()> = &block;
2019-10-02T17:39:57.9461147Z    |                                       ^^^^^^ expected u8, found ()
2019-10-02T17:39:57.9461233Z    = note: expected type `u8`
2019-10-02T17:39:57.9461268Z               found type `()`
2019-10-02T17:39:57.9461311Z    = note: required for the cast to the object type `dyn std::future::Future<Output = ()>`
2019-10-02T17:39:57.9461337Z 
2019-10-02T17:39:57.9461337Z 
2019-10-02T17:39:57.9461391Z error[E0308]: mismatched types
2019-10-02T17:39:57.9461606Z   --> /checkout/src/test/ui/async-await/async-block-control-flow-static-semantics.rs:48:44
2019-10-02T17:39:57.9461646Z    |
2019-10-02T17:39:57.9461857Z LL | fn rethrow_targets_async_block_not_fn() -> Result<u8, MyErr> {
2019-10-02T17:39:57.9462088Z    |    ----------------------------------      ^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found ()
2019-10-02T17:39:57.9462130Z    |    |
2019-10-02T17:39:57.9462188Z    |    implicitly returns `()` as its body has no tail or `return` expression
2019-10-02T17:39:57.9462233Z    |
2019-10-02T17:39:57.9462273Z    = note: expected type `std::result::Result<u8, MyErr>`
2019-10-02T17:39:57.9462355Z 
2019-10-02T17:39:57.9462391Z error[E0308]: mismatched types
2019-10-02T17:39:57.9462622Z   --> /checkout/src/test/ui/async-await/async-block-control-flow-static-semantics.rs:57:50
2019-10-02T17:39:57.9462683Z    |
2019-10-02T17:39:57.9462683Z    |
2019-10-02T17:39:57.9462890Z LL | fn rethrow_targets_async_block_not_async_fn() -> Result<u8, MyErr> {
2019-10-02T17:39:57.9463135Z    |    ----------------------------------------      ^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found ()
2019-10-02T17:39:57.9463208Z    |    |
2019-10-02T17:39:57.9463253Z    |    implicitly returns `()` as its body has no tail or `return` expression
2019-10-02T17:39:57.9463291Z    |
2019-10-02T17:39:57.9463346Z    = note: expected type `std::result::Result<u8, MyErr>`
2019-10-02T17:39:57.9463411Z 
2019-10-02T17:39:57.9463454Z error: aborting due to 8 previous errors
2019-10-02T17:39:57.9463498Z 
2019-10-02T17:39:57.9463536Z Some errors have detailed explanations: E0267, E0271, E0308.
---
2019-10-02T17:39:57.9464036Z 
2019-10-02T17:39:57.9464230Z ---- [ui] ui/async-await/async-error-span.rs stdout ----
2019-10-02T17:39:57.9464289Z diff of stderr:
2019-10-02T17:39:57.9464313Z 
2019-10-02T17:39:57.9464520Z - error[E0698]: type inside `async` object must be known in this context
2019-10-02T17:39:57.9464673Z + error[E0698]: type inside `async` fn body must be known in this context
2019-10-02T17:39:57.9471325Z 3    |
2019-10-02T17:39:57.9471411Z 4 LL |     let a;
2019-10-02T17:39:57.9471458Z 
2019-10-02T17:39:57.9471644Z 5    |         ^ cannot infer type
2019-10-02T17:39:57.9471644Z 5    |         ^ cannot infer type
2019-10-02T17:39:57.9471692Z 6    |
2019-10-02T17:39:57.9472067Z - note: the type is part of the `async` object because of this `await`
2019-10-02T17:39:57.9472116Z + note: the type is part of the `async` fn body because of this `await`
2019-10-02T17:39:57.9472360Z 9    |
2019-10-02T17:39:57.9472360Z 9    |
2019-10-02T17:39:57.9472622Z 10 LL |     get_future().await;
2019-10-02T17:39:57.9472667Z 
2019-10-02T17:39:57.9472705Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9479180Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/async-error-span/async-error-span.stderr
2019-10-02T17:39:57.9479180Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/async-error-span/async-error-span.stderr
2019-10-02T17:39:57.9479531Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9479812Z To only update this specific test, also pass `--test-args async-await/async-error-span.rs`
2019-10-02T17:39:57.9479950Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9480002Z status: exit code: 1
2019-10-02T17:39:57.9480002Z status: exit code: 1
2019-10-02T17:39:57.9481389Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/async-await/async-error-span.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/async-error-span" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/async-error-span/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9481849Z ------------------------------------------
2019-10-02T17:39:57.9481878Z 
2019-10-02T17:39:57.9482064Z ------------------------------------------
2019-10-02T17:39:57.9482123Z stderr:
2019-10-02T17:39:57.9482123Z stderr:
2019-10-02T17:39:57.9482304Z ------------------------------------------
2019-10-02T17:39:57.9482357Z error[E0698]: type inside `async` fn body must be known in this context
2019-10-02T17:39:57.9482786Z    |
2019-10-02T17:39:57.9482786Z    |
2019-10-02T17:39:57.9482827Z LL |     let a; //~ ERROR type inside `async` object must be known in this context
2019-10-02T17:39:57.9482923Z    |
2019-10-02T17:39:57.9482923Z    |
2019-10-02T17:39:57.9482962Z note: the type is part of the `async` fn body because of this `await`
2019-10-02T17:39:57.9483406Z    |
2019-10-02T17:39:57.9483406Z    |
2019-10-02T17:39:57.9483449Z LL |     get_future().await;
2019-10-02T17:39:57.9483529Z 
2019-10-02T17:39:57.9483568Z error: aborting due to previous error
2019-10-02T17:39:57.9483593Z 
2019-10-02T17:39:57.9483957Z For more information about this error, try `rustc --explain E0698`.
---
2019-10-02T17:39:57.9484545Z 1 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9484744Z -   --> $DIR/issue-63388-1.rs:12:10
2019-10-02T17:39:57.9484923Z +   --> $DIR/issue-63388-1.rs:14:9
2019-10-02T17:39:57.9484962Z 3    |
2019-10-02T17:39:57.9485132Z 4 LL |         &'a self, foo: &dyn Foo
2019-10-02T17:39:57.9485371Z 5    |         -------- this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9485830Z 6 LL |     ) -> &dyn Foo
2019-10-02T17:39:57.9486384Z -    |          ^^^^^^^^
2019-10-02T17:39:57.9487191Z -    |          |
2019-10-02T17:39:57.9487191Z -    |          |
2019-10-02T17:39:57.9487465Z -    |          ...but data from `foo` is returned here
2019-10-02T17:39:57.9487891Z + LL |     {
2019-10-02T17:39:57.9487937Z + LL |         foo
2019-10-02T17:39:57.9487937Z + LL |         foo
2019-10-02T17:39:57.9487987Z +    |         ^^^ ...but data from `foo` is returned here
2019-10-02T17:39:57.9488104Z 11 error: aborting due to previous error
2019-10-02T17:39:57.9488147Z 12 
2019-10-02T17:39:57.9488196Z 
2019-10-02T17:39:57.9488223Z 
2019-10-02T17:39:57.9488223Z 
2019-10-02T17:39:57.9488271Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9488631Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/issues/issue-63388-1/issue-63388-1.stderr
2019-10-02T17:39:57.9488923Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9489204Z To only update this specific test, also pass `--test-args async-await/issues/issue-63388-1.rs`
2019-10-02T17:39:57.9489308Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9489356Z status: exit code: 1
2019-10-02T17:39:57.9489356Z status: exit code: 1
2019-10-02T17:39:57.9490149Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/async-await/issues/issue-63388-1.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/issues/issue-63388-1" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/issues/issue-63388-1/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9490623Z ------------------------------------------
2019-10-02T17:39:57.9490668Z 
2019-10-02T17:39:57.9490843Z ------------------------------------------
2019-10-02T17:39:57.9490882Z stderr:
2019-10-02T17:39:57.9490882Z stderr:
2019-10-02T17:39:57.9491068Z ------------------------------------------
2019-10-02T17:39:57.9491108Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9491489Z   --> /checkout/src/test/ui/async-await/issues/issue-63388-1.rs:14:9
2019-10-02T17:39:57.9491532Z    |
2019-10-02T17:39:57.9491720Z LL |         &'a self, foo: &dyn Foo
2019-10-02T17:39:57.9491930Z    |         -------- this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9492131Z LL |     ) -> &dyn Foo //~ ERROR lifetime mismatch
2019-10-02T17:39:57.9492328Z LL |     {
2019-10-02T17:39:57.9492362Z LL |         foo
2019-10-02T17:39:57.9492362Z LL |         foo
2019-10-02T17:39:57.9492418Z    |         ^^^ ...but data from `foo` is returned here
2019-10-02T17:39:57.9492535Z error: aborting due to previous error
2019-10-02T17:39:57.9492559Z 
2019-10-02T17:39:57.9492598Z 
2019-10-02T17:39:57.9492774Z ------------------------------------------
2019-10-02T17:39:57.9492774Z ------------------------------------------
2019-10-02T17:39:57.9492800Z 
2019-10-02T17:39:57.9492820Z 
2019-10-02T17:39:57.9493020Z ---- [ui] ui/async-await/issues/issue-63388-2.rs stdout ----
2019-10-02T17:39:57.9493066Z diff of stderr:
2019-10-02T17:39:57.9493089Z 
2019-10-02T17:39:57.9493120Z 11    |
2019-10-02T17:39:57.9493316Z 12 LL |         foo: &dyn Foo, bar: &'a dyn Foo
2019-10-02T17:39:57.9493357Z 13    |         ^^^ ...but this borrow...
2019-10-02T17:39:57.9493511Z - LL |     ) -> &dyn Foo
2019-10-02T17:39:57.9493724Z -    |          -------- this return type evaluates to the `'static` lifetime...
2019-10-02T17:39:57.9493764Z + ...
2019-10-02T17:39:57.9493798Z + LL |         foo
2019-10-02T17:39:57.9494007Z +    |         --- this return type evaluates to the `'static` lifetime...
2019-10-02T17:39:57.9494047Z 16    |
2019-10-02T17:39:57.9494243Z 17 note: ...can't outlive the lifetime '_ as defined on the method body at 11:14
2019-10-02T17:39:57.9494537Z 18   --> $DIR/issue-63388-2.rs:11:14
2019-10-02T17:39:57.9494616Z 21    |              ^
2019-10-02T17:39:57.9494616Z 21    |              ^
2019-10-02T17:39:57.9494943Z 22 help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime '_ as defined on the method body at 11:14
2019-10-02T17:39:57.9495017Z 23    |
2019-10-02T17:39:57.9495206Z - LL |     ) -> &dyn Foo + '_
2019-10-02T17:39:57.9495366Z -    |          ^^^^^^^^^^^^^
2019-10-02T17:39:57.9495539Z + LL |         foo + '_
2019-10-02T17:39:57.9495608Z 26 
2019-10-02T17:39:57.9495644Z 27 error: aborting due to 2 previous errors
2019-10-02T17:39:57.9495695Z 28 
2019-10-02T17:39:57.9495716Z 
2019-10-02T17:39:57.9495716Z 
2019-10-02T17:39:57.9495737Z 
2019-10-02T17:39:57.9495773Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9496219Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/issues/issue-63388-2/issue-63388-2.stderr
2019-10-02T17:39:57.9497231Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9497521Z To only update this specific test, also pass `--test-args async-await/issues/issue-63388-2.rs`
2019-10-02T17:39:57.9497636Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9497683Z status: exit code: 1
2019-10-02T17:39:57.9497683Z status: exit code: 1
2019-10-02T17:39:57.9498489Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/async-await/issues/issue-63388-2.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/issues/issue-63388-2" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/issues/issue-63388-2/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9498835Z ------------------------------------------
2019-10-02T17:39:57.9498870Z 
2019-10-02T17:39:57.9499089Z ------------------------------------------
2019-10-02T17:39:57.9499153Z stderr:
2019-10-02T17:39:57.9499153Z stderr:
2019-10-02T17:39:57.9499406Z ------------------------------------------
2019-10-02T17:39:57.9499468Z error[E0106]: missing lifetime specifier
2019-10-02T17:39:57.9499730Z   --> /checkout/src/test/ui/async-await/issues/issue-63388-2.rs:12:10
2019-10-02T17:39:57.9499812Z    |
2019-10-02T17:39:57.9500393Z LL |     ) -> &dyn Foo //~ ERROR missing lifetime specifier
2019-10-02T17:39:57.9500597Z    |          ^ help: consider using the named lifetime: `&'a`
2019-10-02T17:39:57.9500655Z    |
2019-10-02T17:39:57.9500917Z    = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from `foo` or `bar`
2019-10-02T17:39:57.9501014Z error: cannot infer an appropriate lifetime
2019-10-02T17:39:57.9501391Z   --> /checkout/src/test/ui/async-await/issues/issue-63388-2.rs:11:9
2019-10-02T17:39:57.9501431Z    |
2019-10-02T17:39:57.9501431Z    |
2019-10-02T17:39:57.9501929Z LL |         foo: &dyn Foo, bar: &'a dyn Foo //~ ERROR cannot infer
2019-10-02T17:39:57.9501975Z    |         ^^^ ...but this borrow...
2019-10-02T17:39:57.9502072Z LL |         foo
2019-10-02T17:39:57.9502072Z LL |         foo
2019-10-02T17:39:57.9502285Z    |         --- this return type evaluates to the `'static` lifetime...
2019-10-02T17:39:57.9502327Z    |
2019-10-02T17:39:57.9502538Z note: ...can't outlive the lifetime '_ as defined on the method body at 11:14
2019-10-02T17:39:57.9502932Z   --> /checkout/src/test/ui/async-await/issues/issue-63388-2.rs:11:14
2019-10-02T17:39:57.9502973Z    |
2019-10-02T17:39:57.9503167Z LL |         foo: &dyn Foo, bar: &'a dyn Foo //~ ERROR cannot infer
2019-10-02T17:39:57.9503226Z    |              ^
2019-10-02T17:39:57.9503489Z help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime '_ as defined on the method body at 11:14
2019-10-02T17:39:57.9503859Z LL |         foo + '_
2019-10-02T17:39:57.9503897Z    |
2019-10-02T17:39:57.9503920Z 
2019-10-02T17:39:57.9503956Z error: aborting due to 2 previous errors
---
2019-10-02T17:39:57.9505082Z 
2019-10-02T17:39:57.9505269Z ---- [ui] ui/async-await/unresolved_type_param.rs stdout ----
2019-10-02T17:39:57.9505309Z diff of stderr:
2019-10-02T17:39:57.9505349Z 
2019-10-02T17:39:57.9505546Z - error[E0698]: type inside `async` object must be known in this context
2019-10-02T17:39:57.9505592Z + error[E0698]: type inside `async` fn body must be known in this context
2019-10-02T17:39:57.9505830Z 3    |
2019-10-02T17:39:57.9505830Z 3    |
2019-10-02T17:39:57.9505865Z 4 LL |     bar().await;
2019-10-02T17:39:57.9505941Z 5    |     ^^^ cannot infer type for `T`
2019-10-02T17:39:57.9506159Z 6    |
2019-10-02T17:39:57.9506159Z 6    |
2019-10-02T17:39:57.9506542Z - note: the type is part of the `async` object because of this `await`
2019-10-02T17:39:57.9506960Z + note: the type is part of the `async` fn body because of this `await`
2019-10-02T17:39:57.9507290Z 9    |
2019-10-02T17:39:57.9507290Z 9    |
2019-10-02T17:39:57.9507334Z 10 LL |     bar().await;
2019-10-02T17:39:57.9507489Z 
2019-10-02T17:39:57.9507535Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9507857Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/unresolved_type_param/unresolved_type_param.stderr
2019-10-02T17:39:57.9507857Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/unresolved_type_param/unresolved_type_param.stderr
2019-10-02T17:39:57.9508132Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9509136Z To only update this specific test, also pass `--test-args async-await/unresolved_type_param.rs`
2019-10-02T17:39:57.9509252Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9509299Z status: exit code: 1
2019-10-02T17:39:57.9509299Z status: exit code: 1
2019-10-02T17:39:57.9510095Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/async-await/unresolved_type_param.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/unresolved_type_param" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/async-await/unresolved_type_param/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9510561Z ------------------------------------------
2019-10-02T17:39:57.9510613Z 
2019-10-02T17:39:57.9510793Z ------------------------------------------
2019-10-02T17:39:57.9510831Z stderr:
2019-10-02T17:39:57.9510831Z stderr:
2019-10-02T17:39:57.9511015Z ------------------------------------------
2019-10-02T17:39:57.9511059Z error[E0698]: type inside `async` fn body must be known in this context
2019-10-02T17:39:57.9511321Z    |
2019-10-02T17:39:57.9511321Z    |
2019-10-02T17:39:57.9511356Z LL |     bar().await;
2019-10-02T17:39:57.9511428Z    |
2019-10-02T17:39:57.9511428Z    |
2019-10-02T17:39:57.9511485Z note: the type is part of the `async` fn body because of this `await`
2019-10-02T17:39:57.9511731Z    |
2019-10-02T17:39:57.9511731Z    |
2019-10-02T17:39:57.9511782Z LL |     bar().await;
2019-10-02T17:39:57.9511840Z 
2019-10-02T17:39:57.9511875Z error: aborting due to previous error
2019-10-02T17:39:57.9512045Z 
2019-10-02T17:39:57.9512276Z For more information about this error, try `rustc --explain E0698`.
---
2019-10-02T17:39:57.9512955Z 1 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9513182Z -   --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:8:45
2019-10-02T17:39:57.9513567Z +   --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:8:52
2019-10-02T17:39:57.9513605Z 3    |
2019-10-02T17:39:57.9513787Z 4 LL |     async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
2019-10-02T17:39:57.9514148Z -    |                          ----               ^^^^
2019-10-02T17:39:57.9514352Z -    |                          |                  |
2019-10-02T17:39:57.9514573Z -    |                          |                  ...but data from `f` is returned here
2019-10-02T17:39:57.9514791Z +    |                          ----               ----   ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9514910Z 8    |                          this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9514967Z 9 
2019-10-02T17:39:57.9515004Z 10 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9515029Z 
2019-10-02T17:39:57.9515029Z 
2019-10-02T17:39:57.9515230Z -   --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:11:55
2019-10-02T17:39:57.9515619Z +   --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:11:82
2019-10-02T17:39:57.9515660Z 12    |
2019-10-02T17:39:57.9515877Z 13 LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
2019-10-02T17:39:57.9516103Z -    |                          -----                        ^^^^^^^^^^^^^^^^^
2019-10-02T17:39:57.9516660Z -    |                          |                            |
2019-10-02T17:39:57.9516977Z -    |                          |                            ...but data from `f` is returned here
2019-10-02T17:39:57.9517314Z +    |                          -----                        -----------------          ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9517436Z 17    |                          this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9517505Z 18 
2019-10-02T17:39:57.9517551Z 19 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9517582Z 
2019-10-02T17:39:57.9517582Z 
2019-10-02T17:39:57.9517837Z -   --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:17:58
2019-10-02T17:39:57.9518104Z +   --> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:17:64
2019-10-02T17:39:57.9518154Z 21    |
2019-10-02T17:39:57.9518403Z 22 LL |     async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg }
2019-10-02T17:39:57.9518681Z -    |                                  -----                   ^^^
2019-10-02T17:39:57.9519206Z -    |                                  |                       ...but data from `arg` is returned here
2019-10-02T17:39:57.9519206Z -    |                                  |                       ...but data from `arg` is returned here
2019-10-02T17:39:57.9519529Z +    |                                  -----                   ---   ^^^ ...but data from `arg` is returned here
2019-10-02T17:39:57.9519646Z 26    |                                  this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9519715Z 27 
2019-10-02T17:39:57.9519762Z 28 error: aborting due to 3 previous errors
2019-10-02T17:39:57.9519792Z 
2019-10-02T17:39:57.9519792Z 
2019-10-02T17:39:57.9519819Z 
2019-10-02T17:39:57.9520040Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9520505Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async/arbitrary_self_types_pin_lifetime_mismatch-async.stderr
2019-10-02T17:39:57.9520871Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9521180Z To only update this specific test, also pass `--test-args self/arbitrary_self_types_pin_lifetime_mismatch-async.rs`
2019-10-02T17:39:57.9521278Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9521315Z status: exit code: 1
2019-10-02T17:39:57.9521315Z status: exit code: 1
2019-10-02T17:39:57.9522164Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9522445Z ------------------------------------------
2019-10-02T17:39:57.9522489Z 
2019-10-02T17:39:57.9522665Z ------------------------------------------
2019-10-02T17:39:57.9522702Z stderr:
2019-10-02T17:39:57.9522702Z stderr:
2019-10-02T17:39:57.9522868Z ------------------------------------------
2019-10-02T17:39:57.9522924Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9523129Z   --> /checkout/src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.rs:8:52
2019-10-02T17:39:57.9523170Z    |
2019-10-02T17:39:57.9523370Z LL |     async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
2019-10-02T17:39:57.9523580Z    |                          ----               ----   ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9523868Z    |                          this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9523896Z 
2019-10-02T17:39:57.9523930Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9524165Z   --> /checkout/src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.rs:11:82
2019-10-02T17:39:57.9524165Z   --> /checkout/src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.rs:11:82
2019-10-02T17:39:57.9524213Z    |
2019-10-02T17:39:57.9524426Z LL |     async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
2019-10-02T17:39:57.9524688Z    |                          -----                        -----------------          ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9524783Z    |                          this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9524828Z 
2019-10-02T17:39:57.9524863Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9525081Z   --> /checkout/src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.rs:17:64
2019-10-02T17:39:57.9525081Z   --> /checkout/src/test/ui/self/arbitrary_self_types_pin_lifetime_mismatch-async.rs:17:64
2019-10-02T17:39:57.9525145Z    |
2019-10-02T17:39:57.9525355Z LL |     async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg } //~ ERROR E0623
2019-10-02T17:39:57.9525584Z    |                                  -----                   ---   ^^^ ...but data from `arg` is returned here
2019-10-02T17:39:57.9525698Z    |                                  this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9525727Z 
2019-10-02T17:39:57.9525763Z error: aborting due to 3 previous errors
2019-10-02T17:39:57.9525806Z 
---
2019-10-02T17:39:57.9527527Z 1 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9527826Z -   --> $DIR/lt-ref-self-async.rs:13:42
2019-10-02T17:39:57.9528042Z +   --> $DIR/lt-ref-self-async.rs:14:9
2019-10-02T17:39:57.9528089Z 3    |
2019-10-02T17:39:57.9528341Z 4 LL |     async fn ref_self(&self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9528652Z -    |                       -----              ^^^^
2019-10-02T17:39:57.9528914Z -    |                       |                  |
2019-10-02T17:39:57.9529195Z -    |                       |                  ...but data from `f` is returned here
2019-10-02T17:39:57.9529428Z +    |                       -----              ----
2019-10-02T17:39:57.9529555Z 8    |                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9529608Z + LL |         f
2019-10-02T17:39:57.9529608Z + LL |         f
2019-10-02T17:39:57.9529656Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9529773Z 10 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9529995Z -   --> $DIR/lt-ref-self-async.rs:19:48
2019-10-02T17:39:57.9530210Z +   --> $DIR/lt-ref-self-async.rs:20:9
2019-10-02T17:39:57.9530499Z 12    |
2019-10-02T17:39:57.9530499Z 12    |
2019-10-02T17:39:57.9530864Z 13 LL |     async fn ref_Self(self: &Self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9531058Z -    |                             -----              ^^^^
2019-10-02T17:39:57.9531262Z -    |                             |                  |
2019-10-02T17:39:57.9531467Z -    |                             |                  ...but data from `f` is returned here
2019-10-02T17:39:57.9531649Z +    |                             -----              ----
2019-10-02T17:39:57.9531751Z 17    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9531790Z + LL |         f
2019-10-02T17:39:57.9531790Z + LL |         f
2019-10-02T17:39:57.9532012Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9532091Z 19 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9532460Z -   --> $DIR/lt-ref-self-async.rs:23:57
2019-10-02T17:39:57.9532629Z +   --> $DIR/lt-ref-self-async.rs:24:9
2019-10-02T17:39:57.9532666Z 21    |
2019-10-02T17:39:57.9532666Z 21    |
2019-10-02T17:39:57.9532860Z 22 LL |     async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9533231Z -    |                                     -----               ^^^^
2019-10-02T17:39:57.9533412Z -    |                                     |                   |
2019-10-02T17:39:57.9533616Z -    |                                     |                   ...but data from `f` is returned here
2019-10-02T17:39:57.9533818Z +    |                                     -----               ----
2019-10-02T17:39:57.9533903Z 26    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9533966Z + LL |         f
2019-10-02T17:39:57.9533966Z + LL |         f
2019-10-02T17:39:57.9534001Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9534084Z 28 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9534257Z -   --> $DIR/lt-ref-self-async.rs:27:57
2019-10-02T17:39:57.9534425Z +   --> $DIR/lt-ref-self-async.rs:28:9
2019-10-02T17:39:57.9534477Z 30    |
2019-10-02T17:39:57.9534477Z 30    |
2019-10-02T17:39:57.9534668Z 31 LL |     async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9534849Z -    |                                     -----               ^^^^
2019-10-02T17:39:57.9535045Z -    |                                     |                   |
2019-10-02T17:39:57.9535255Z -    |                                     |                   ...but data from `f` is returned here
2019-10-02T17:39:57.9535439Z +    |                                     -----               ----
2019-10-02T17:39:57.9535623Z 35    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9535662Z + LL |         f
2019-10-02T17:39:57.9535662Z + LL |         f
2019-10-02T17:39:57.9535714Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9535780Z 37 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9536227Z -   --> $DIR/lt-ref-self-async.rs:31:66
2019-10-02T17:39:57.9536852Z +   --> $DIR/lt-ref-self-async.rs:32:9
2019-10-02T17:39:57.9536907Z 39    |
2019-10-02T17:39:57.9536907Z 39    |
2019-10-02T17:39:57.9537167Z 40 LL |     async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9537443Z -    |                                             -----                ^^^^
2019-10-02T17:39:57.9537693Z -    |                                             |                    |
2019-10-02T17:39:57.9537975Z -    |                                             |                    ...but data from `f` is returned here
2019-10-02T17:39:57.9538251Z +    |                                             -----                ----
2019-10-02T17:39:57.9538379Z 44    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9538451Z + LL |         f
2019-10-02T17:39:57.9538451Z + LL |         f
2019-10-02T17:39:57.9538506Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9538614Z 46 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9538843Z -   --> $DIR/lt-ref-self-async.rs:35:62
2019-10-02T17:39:57.9539060Z +   --> $DIR/lt-ref-self-async.rs:36:9
2019-10-02T17:39:57.9539125Z 48    |
2019-10-02T17:39:57.9539125Z 48    |
2019-10-02T17:39:57.9539374Z 49 LL |     async fn box_pin_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9539622Z -    |                                         -----                ^^^^
2019-10-02T17:39:57.9540037Z -    |                                         |                    |
2019-10-02T17:39:57.9540275Z -    |                                         |                    ...but data from `f` is returned here
2019-10-02T17:39:57.9540464Z +    |                                         -----                ----
2019-10-02T17:39:57.9540573Z 53    |                                         this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9540613Z + LL |         f
2019-10-02T17:39:57.9540613Z + LL |         f
2019-10-02T17:39:57.9540649Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9540737Z 55 error: aborting due to 6 previous errors
2019-10-02T17:39:57.9540770Z 56 
2019-10-02T17:39:57.9540810Z 
2019-10-02T17:39:57.9540831Z 
2019-10-02T17:39:57.9540831Z 
2019-10-02T17:39:57.9540866Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9541110Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/lt-ref-self-async/lt-ref-self-async.stderr
2019-10-02T17:39:57.9541326Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9541526Z To only update this specific test, also pass `--test-args self/elision/lt-ref-self-async.rs`
2019-10-02T17:39:57.9541605Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9541646Z status: exit code: 1
2019-10-02T17:39:57.9541646Z status: exit code: 1
2019-10-02T17:39:57.9542225Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/self/elision/lt-ref-self-async.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/lt-ref-self-async" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/lt-ref-self-async/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9542613Z ------------------------------------------
2019-10-02T17:39:57.9542657Z 
2019-10-02T17:39:57.9542827Z ------------------------------------------
2019-10-02T17:39:57.9542863Z stderr:
2019-10-02T17:39:57.9542863Z stderr:
2019-10-02T17:39:57.9543024Z ------------------------------------------
2019-10-02T17:39:57.9543080Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9543329Z   --> /checkout/src/test/ui/self/elision/lt-ref-self-async.rs:14:9
2019-10-02T17:39:57.9543377Z    |
2019-10-02T17:39:57.9543599Z LL |     async fn ref_self(&self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9543947Z    |                       -----              ----
2019-10-02T17:39:57.9544048Z    |                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9544048Z    |                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9544249Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9544289Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9544416Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9544607Z   --> /checkout/src/test/ui/self/elision/lt-ref-self-async.rs:20:9
2019-10-02T17:39:57.9544662Z    |
2019-10-02T17:39:57.9544662Z    |
2019-10-02T17:39:57.9544837Z LL |     async fn ref_Self(self: &Self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9545015Z    |                             -----              ----
2019-10-02T17:39:57.9545115Z    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9545115Z    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9545156Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9545195Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9545266Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9545456Z   --> /checkout/src/test/ui/self/elision/lt-ref-self-async.rs:24:9
2019-10-02T17:39:57.9545514Z    |
2019-10-02T17:39:57.9545514Z    |
2019-10-02T17:39:57.9545695Z LL |     async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9545886Z    |                                     -----               ----
2019-10-02T17:39:57.9546163Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9546163Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9546213Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9546251Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9546481Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9546952Z   --> /checkout/src/test/ui/self/elision/lt-ref-self-async.rs:28:9
2019-10-02T17:39:57.9547023Z    |
2019-10-02T17:39:57.9547023Z    |
2019-10-02T17:39:57.9547268Z LL |     async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9547508Z    |                                     -----               ----
2019-10-02T17:39:57.9547637Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9547637Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9547703Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9547772Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9547848Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9548102Z   --> /checkout/src/test/ui/self/elision/lt-ref-self-async.rs:32:9
2019-10-02T17:39:57.9548170Z    |
2019-10-02T17:39:57.9548170Z    |
2019-10-02T17:39:57.9553240Z LL |     async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9553496Z    |                                             -----                ----
2019-10-02T17:39:57.9553618Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9553618Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9553665Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9553724Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9553978Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9554227Z   --> /checkout/src/test/ui/self/elision/lt-ref-self-async.rs:36:9
2019-10-02T17:39:57.9554288Z    |
2019-10-02T17:39:57.9554288Z    |
2019-10-02T17:39:57.9554580Z LL |     async fn box_pin_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9554819Z    |                                         -----                ----
2019-10-02T17:39:57.9554932Z    |                                         this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9554932Z    |                                         this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9554978Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9555036Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9555100Z error: aborting due to 6 previous errors
2019-10-02T17:39:57.9555125Z 
2019-10-02T17:39:57.9555165Z 
2019-10-02T17:39:57.9557296Z ------------------------------------------
---
2019-10-02T17:39:57.9557871Z 1 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9558135Z -   --> $DIR/ref-mut-self-async.rs:13:46
2019-10-02T17:39:57.9558364Z +   --> $DIR/ref-mut-self-async.rs:14:9
2019-10-02T17:39:57.9558412Z 3    |
2019-10-02T17:39:57.9558650Z 4 LL |     async fn ref_self(&mut self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9558909Z -    |                       ---------              ^^^^
2019-10-02T17:39:57.9559144Z -    |                       |                      |
2019-10-02T17:39:57.9559409Z -    |                       |                      ...but data from `f` is returned here
2019-10-02T17:39:57.9559665Z +    |                       ---------              ----
2019-10-02T17:39:57.9560246Z 8    |                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9560333Z + LL |         f
2019-10-02T17:39:57.9560333Z + LL |         f
2019-10-02T17:39:57.9560373Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9560474Z 10 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9560719Z -   --> $DIR/ref-mut-self-async.rs:19:52
2019-10-02T17:39:57.9560903Z +   --> $DIR/ref-mut-self-async.rs:20:9
2019-10-02T17:39:57.9560960Z 12    |
2019-10-02T17:39:57.9560960Z 12    |
2019-10-02T17:39:57.9561162Z 13 LL |     async fn ref_Self(self: &mut Self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9561360Z -    |                             ---------              ^^^^
2019-10-02T17:39:57.9561556Z -    |                             |                      |
2019-10-02T17:39:57.9561797Z -    |                             |                      ...but data from `f` is returned here
2019-10-02T17:39:57.9562148Z +    |                             ---------              ----
2019-10-02T17:39:57.9562260Z 17    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9562301Z + LL |         f
2019-10-02T17:39:57.9562301Z + LL |         f
2019-10-02T17:39:57.9562512Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9562606Z 19 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9562787Z -   --> $DIR/ref-mut-self-async.rs:23:61
2019-10-02T17:39:57.9562978Z +   --> $DIR/ref-mut-self-async.rs:24:9
2019-10-02T17:39:57.9563015Z 21    |
2019-10-02T17:39:57.9563015Z 21    |
2019-10-02T17:39:57.9563207Z 22 LL |     async fn box_ref_Self(self: Box<&mut Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9563415Z -    |                                     ---------               ^^^^
2019-10-02T17:39:57.9563610Z -    |                                     |                       |
2019-10-02T17:39:57.9563826Z -    |                                     |                       ...but data from `f` is returned here
2019-10-02T17:39:57.9564683Z +    |                                     ---------               ----
2019-10-02T17:39:57.9564861Z 26    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9564928Z + LL |         f
2019-10-02T17:39:57.9564928Z + LL |         f
2019-10-02T17:39:57.9564964Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9565052Z 28 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9565253Z -   --> $DIR/ref-mut-self-async.rs:27:61
2019-10-02T17:39:57.9565419Z +   --> $DIR/ref-mut-self-async.rs:28:9
2019-10-02T17:39:57.9565454Z 30    |
2019-10-02T17:39:57.9565454Z 30    |
2019-10-02T17:39:57.9565659Z 31 LL |     async fn pin_ref_Self(self: Pin<&mut Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9565846Z -    |                                     ---------               ^^^^
2019-10-02T17:39:57.9566204Z -    |                                     |                       |
2019-10-02T17:39:57.9566881Z -    |                                     |                       ...but data from `f` is returned here
2019-10-02T17:39:57.9567145Z +    |                                     ---------               ----
2019-10-02T17:39:57.9567288Z 35    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9567341Z + LL |         f
2019-10-02T17:39:57.9567341Z + LL |         f
2019-10-02T17:39:57.9567389Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9567499Z 37 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9567731Z -   --> $DIR/ref-mut-self-async.rs:31:70
2019-10-02T17:39:57.9567969Z +   --> $DIR/ref-mut-self-async.rs:32:9
2019-10-02T17:39:57.9568016Z 39    |
2019-10-02T17:39:57.9568016Z 39    |
2019-10-02T17:39:57.9568273Z 40 LL |     async fn box_box_ref_Self(self: Box<Box<&mut Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9568561Z -    |                                             ---------                ^^^^
2019-10-02T17:39:57.9568817Z -    |                                             |                        |
2019-10-02T17:39:57.9569106Z -    |                                             |                        ...but data from `f` is returned here
2019-10-02T17:39:57.9569390Z +    |                                             ---------                ----
2019-10-02T17:39:57.9569508Z 44    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9569579Z + LL |         f
2019-10-02T17:39:57.9569579Z + LL |         f
2019-10-02T17:39:57.9569628Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9572945Z 46 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9573468Z -   --> $DIR/ref-mut-self-async.rs:35:70
2019-10-02T17:39:57.9573667Z +   --> $DIR/ref-mut-self-async.rs:36:9
2019-10-02T17:39:57.9573705Z 48    |
2019-10-02T17:39:57.9573705Z 48    |
2019-10-02T17:39:57.9573927Z 49 LL |     async fn box_pin_ref_Self(self: Box<Pin<&mut Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9574128Z -    |                                             ---------                ^^^^
2019-10-02T17:39:57.9574331Z -    |                                             |                        |
2019-10-02T17:39:57.9574581Z -    |                                             |                        ...but data from `f` is returned here
2019-10-02T17:39:57.9574784Z +    |                                             ---------                ----
2019-10-02T17:39:57.9574896Z 53    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9574938Z + LL |         f
2019-10-02T17:39:57.9574938Z + LL |         f
2019-10-02T17:39:57.9574975Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9575230Z 55 error: aborting due to 6 previous errors
2019-10-02T17:39:57.9575264Z 56 
2019-10-02T17:39:57.9575306Z 
2019-10-02T17:39:57.9575328Z 
2019-10-02T17:39:57.9575328Z 
2019-10-02T17:39:57.9575366Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9575904Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-mut-self-async/ref-mut-self-async.stderr
2019-10-02T17:39:57.9576922Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9577298Z To only update this specific test, also pass `--test-args self/elision/ref-mut-self-async.rs`
2019-10-02T17:39:57.9577405Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9577453Z status: exit code: 1
2019-10-02T17:39:57.9577453Z status: exit code: 1
2019-10-02T17:39:57.9578252Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/self/elision/ref-mut-self-async.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-mut-self-async" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-mut-self-async/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9578605Z ------------------------------------------
2019-10-02T17:39:57.9578658Z 
2019-10-02T17:39:57.9578884Z ------------------------------------------
2019-10-02T17:39:57.9578933Z stderr:
2019-10-02T17:39:57.9578933Z stderr:
2019-10-02T17:39:57.9579165Z ------------------------------------------
2019-10-02T17:39:57.9579217Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9579465Z   --> /checkout/src/test/ui/self/elision/ref-mut-self-async.rs:14:9
2019-10-02T17:39:57.9579518Z    |
2019-10-02T17:39:57.9580167Z LL |     async fn ref_self(&mut self, f: &u32) -> &u32 { //~ ERROR lifetime mismatch
2019-10-02T17:39:57.9580392Z    |                       ---------              ----
2019-10-02T17:39:57.9580506Z    |                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9580553Z LL |         f
2019-10-02T17:39:57.9580553Z LL |         f
2019-10-02T17:39:57.9580604Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9580691Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9580915Z   --> /checkout/src/test/ui/self/elision/ref-mut-self-async.rs:20:9
2019-10-02T17:39:57.9580977Z    |
2019-10-02T17:39:57.9580977Z    |
2019-10-02T17:39:57.9581187Z LL |     async fn ref_Self(self: &mut Self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9581393Z    |                             ---------              ----
2019-10-02T17:39:57.9581561Z    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9581561Z    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9581618Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9581680Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9581746Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9582128Z   --> /checkout/src/test/ui/self/elision/ref-mut-self-async.rs:24:9
2019-10-02T17:39:57.9582188Z    |
2019-10-02T17:39:57.9582188Z    |
2019-10-02T17:39:57.9582751Z LL |     async fn box_ref_Self(self: Box<&mut Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9582944Z    |                                     ---------               ----
2019-10-02T17:39:57.9583049Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9583049Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9583093Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9583150Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9583332Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9583562Z   --> /checkout/src/test/ui/self/elision/ref-mut-self-async.rs:28:9
2019-10-02T17:39:57.9583619Z    |
2019-10-02T17:39:57.9583619Z    |
2019-10-02T17:39:57.9583817Z LL |     async fn pin_ref_Self(self: Pin<&mut Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9584403Z    |                                     ---------               ----
2019-10-02T17:39:57.9584510Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9584510Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9584550Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9584605Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9584661Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9584867Z   --> /checkout/src/test/ui/self/elision/ref-mut-self-async.rs:32:9
2019-10-02T17:39:57.9584921Z    |
2019-10-02T17:39:57.9584921Z    |
2019-10-02T17:39:57.9585106Z LL |     async fn box_box_ref_Self(self: Box<Box<&mut Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9585485Z    |                                             ---------                ----
2019-10-02T17:39:57.9585597Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9585597Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9585640Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9585927Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9585987Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9586844Z   --> /checkout/src/test/ui/self/elision/ref-mut-self-async.rs:36:9
2019-10-02T17:39:57.9586904Z    |
2019-10-02T17:39:57.9586904Z    |
2019-10-02T17:39:57.9587208Z LL |     async fn box_pin_ref_Self(self: Box<Pin<&mut Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9587469Z    |                                             ---------                ----
2019-10-02T17:39:57.9587613Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9587613Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9587685Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9587737Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9587823Z error: aborting due to 6 previous errors
2019-10-02T17:39:57.9587875Z 
2019-10-02T17:39:57.9587902Z 
2019-10-02T17:39:57.9588132Z ------------------------------------------
---
2019-10-02T17:39:57.9597247Z 1 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9597534Z -   --> $DIR/ref-mut-struct-async.rs:13:56
2019-10-02T17:39:57.9597758Z +   --> $DIR/ref-mut-struct-async.rs:14:9
2019-10-02T17:39:57.9597826Z 3    |
2019-10-02T17:39:57.9598095Z 4 LL |     async fn ref_Struct(self: &mut Struct, f: &u32) -> &u32 {
2019-10-02T17:39:57.9598343Z -    |                               -----------              ^^^^
2019-10-02T17:39:57.9598584Z -    |                               |                        |
2019-10-02T17:39:57.9598886Z -    |                               |                        ...but data from `f` is returned here
2019-10-02T17:39:57.9599141Z +    |                               -----------              ----
2019-10-02T17:39:57.9599525Z 8    |                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9599592Z + LL |         f
2019-10-02T17:39:57.9599592Z + LL |         f
2019-10-02T17:39:57.9599643Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9599757Z 10 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9600192Z -   --> $DIR/ref-mut-struct-async.rs:17:65
2019-10-02T17:39:57.9600591Z +   --> $DIR/ref-mut-struct-async.rs:18:9
2019-10-02T17:39:57.9600649Z 12    |
2019-10-02T17:39:57.9600649Z 12    |
2019-10-02T17:39:57.9600849Z 13 LL |     async fn box_ref_Struct(self: Box<&mut Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9601045Z -    |                                       -----------               ^^^^
2019-10-02T17:39:57.9601343Z -    |                                       |                         |
2019-10-02T17:39:57.9601603Z -    |                                       |                         ...but data from `f` is returned here
2019-10-02T17:39:57.9601954Z +    |                                       -----------               ----
2019-10-02T17:39:57.9602057Z 17    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9602096Z + LL |         f
2019-10-02T17:39:57.9602096Z + LL |         f
2019-10-02T17:39:57.9602149Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9602224Z 19 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9602410Z -   --> $DIR/ref-mut-struct-async.rs:21:65
2019-10-02T17:39:57.9602575Z +   --> $DIR/ref-mut-struct-async.rs:22:9
2019-10-02T17:39:57.9602610Z 21    |
2019-10-02T17:39:57.9602610Z 21    |
2019-10-02T17:39:57.9602821Z 22 LL |     async fn pin_ref_Struct(self: Pin<&mut Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9603010Z -    |                                       -----------               ^^^^
2019-10-02T17:39:57.9603371Z -    |                                       |                         |
2019-10-02T17:39:57.9603607Z -    |                                       |                         ...but data from `f` is returned here
2019-10-02T17:39:57.9604009Z +    |                                       -----------               ----
2019-10-02T17:39:57.9604122Z 26    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9604174Z + LL |         f
2019-10-02T17:39:57.9604174Z + LL |         f
2019-10-02T17:39:57.9604211Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9604300Z 28 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9604495Z -   --> $DIR/ref-mut-struct-async.rs:25:74
2019-10-02T17:39:57.9604669Z +   --> $DIR/ref-mut-struct-async.rs:26:9
2019-10-02T17:39:57.9604722Z 30    |
2019-10-02T17:39:57.9604722Z 30    |
2019-10-02T17:39:57.9604926Z 31 LL |     async fn box_box_ref_Struct(self: Box<Box<&mut Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9605128Z -    |                                               -----------                ^^^^
2019-10-02T17:39:57.9605347Z -    |                                               |                          |
2019-10-02T17:39:57.9605575Z -    |                                               |                          ...but data from `f` is returned here
2019-10-02T17:39:57.9605777Z +    |                                               -----------                ----
2019-10-02T17:39:57.9605891Z 35    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9605936Z + LL |         f
2019-10-02T17:39:57.9605936Z + LL |         f
2019-10-02T17:39:57.9606182Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9606254Z 37 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9608103Z -   --> $DIR/ref-mut-struct-async.rs:29:74
2019-10-02T17:39:57.9608356Z +   --> $DIR/ref-mut-struct-async.rs:30:9
2019-10-02T17:39:57.9608406Z 39    |
2019-10-02T17:39:57.9608406Z 39    |
2019-10-02T17:39:57.9608700Z 40 LL |     async fn box_pin_ref_Struct(self: Box<Pin<&mut Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9608963Z -    |                                               -----------                ^^^^
2019-10-02T17:39:57.9609222Z -    |                                               |                          |
2019-10-02T17:39:57.9609771Z -    |                                               |                          ...but data from `f` is returned here
2019-10-02T17:39:57.9610040Z +    |                                               -----------                ----
2019-10-02T17:39:57.9610423Z 44    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9610461Z + LL |         f
2019-10-02T17:39:57.9610461Z + LL |         f
2019-10-02T17:39:57.9610497Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9610582Z 46 error: aborting due to 5 previous errors
2019-10-02T17:39:57.9610615Z 47 
2019-10-02T17:39:57.9610636Z 
2019-10-02T17:39:57.9610673Z 
2019-10-02T17:39:57.9610673Z 
2019-10-02T17:39:57.9610707Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9610972Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-mut-struct-async/ref-mut-struct-async.stderr
2019-10-02T17:39:57.9611189Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9611395Z To only update this specific test, also pass `--test-args self/elision/ref-mut-struct-async.rs`
2019-10-02T17:39:57.9611463Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9611517Z status: exit code: 1
2019-10-02T17:39:57.9611517Z status: exit code: 1
2019-10-02T17:39:57.9612089Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/self/elision/ref-mut-struct-async.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-mut-struct-async" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-mut-struct-async/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9612353Z ------------------------------------------
2019-10-02T17:39:57.9612379Z 
2019-10-02T17:39:57.9612562Z ------------------------------------------
2019-10-02T17:39:57.9612597Z stderr:
2019-10-02T17:39:57.9612597Z stderr:
2019-10-02T17:39:57.9612760Z ------------------------------------------
2019-10-02T17:39:57.9612815Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9613002Z   --> /checkout/src/test/ui/self/elision/ref-mut-struct-async.rs:14:9
2019-10-02T17:39:57.9613043Z    |
2019-10-02T17:39:57.9613244Z LL |     async fn ref_Struct(self: &mut Struct, f: &u32) -> &u32 {
2019-10-02T17:39:57.9613425Z    |                               -----------              ----
2019-10-02T17:39:57.9613524Z    |                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9613524Z    |                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9613567Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9613612Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9613685Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9613872Z   --> /checkout/src/test/ui/self/elision/ref-mut-struct-async.rs:18:9
2019-10-02T17:39:57.9613909Z    |
2019-10-02T17:39:57.9613909Z    |
2019-10-02T17:39:57.9614116Z LL |     async fn box_ref_Struct(self: Box<&mut Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9614305Z    |                                       -----------               ----
2019-10-02T17:39:57.9614404Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9614404Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9614445Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9614481Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9614553Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9614852Z   --> /checkout/src/test/ui/self/elision/ref-mut-struct-async.rs:22:9
2019-10-02T17:39:57.9614907Z    |
2019-10-02T17:39:57.9614907Z    |
2019-10-02T17:39:57.9615091Z LL |     async fn pin_ref_Struct(self: Pin<&mut Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9615275Z    |                                       -----------               ----
2019-10-02T17:39:57.9615448Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9615448Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9615488Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9615524Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9615603Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9615815Z   --> /checkout/src/test/ui/self/elision/ref-mut-struct-async.rs:26:9
2019-10-02T17:39:57.9615868Z    |
2019-10-02T17:39:57.9615868Z    |
2019-10-02T17:39:57.9616241Z LL |     async fn box_box_ref_Struct(self: Box<Box<&mut Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9617054Z    |                                               -----------                ----
2019-10-02T17:39:57.9617216Z    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9617216Z    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9617272Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9617341Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9617417Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9617684Z   --> /checkout/src/test/ui/self/elision/ref-mut-struct-async.rs:30:9
2019-10-02T17:39:57.9617752Z    |
2019-10-02T17:39:57.9617752Z    |
2019-10-02T17:39:57.9618011Z LL |     async fn box_pin_ref_Struct(self: Box<Pin<&mut Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9618268Z    |                                               -----------                ----
2019-10-02T17:39:57.9618409Z    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9618409Z    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9618465Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9618534Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9618618Z error: aborting due to 5 previous errors
2019-10-02T17:39:57.9618649Z 
2019-10-02T17:39:57.9618676Z 
2019-10-02T17:39:57.9618923Z ------------------------------------------
---
2019-10-02T17:39:57.9619354Z 1 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9619591Z -   --> $DIR/ref-self-async.rs:22:42
2019-10-02T17:39:57.9619964Z +   --> $DIR/ref-self-async.rs:23:9
2019-10-02T17:39:57.9620195Z 3    |
2019-10-02T17:39:57.9620378Z 4 LL |     async fn ref_self(&self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9620576Z -    |                       -----              ^^^^
2019-10-02T17:39:57.9620751Z -    |                       |                  |
2019-10-02T17:39:57.9620954Z -    |                       |                  ...but data from `f` is returned here
2019-10-02T17:39:57.9621160Z +    |                       -----              ----
2019-10-02T17:39:57.9621242Z 8    |                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9621299Z + LL |         f
2019-10-02T17:39:57.9621299Z + LL |         f
2019-10-02T17:39:57.9621336Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9621424Z 10 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9621597Z -   --> $DIR/ref-self-async.rs:28:48
2019-10-02T17:39:57.9621763Z +   --> $DIR/ref-self-async.rs:29:9
2019-10-02T17:39:57.9621914Z 12    |
2019-10-02T17:39:57.9621914Z 12    |
2019-10-02T17:39:57.9622152Z 13 LL |     async fn ref_Self(self: &Self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9622341Z -    |                             -----              ^^^^
2019-10-02T17:39:57.9622521Z -    |                             |                  |
2019-10-02T17:39:57.9622829Z -    |                             |                  ...but data from `f` is returned here
2019-10-02T17:39:57.9623051Z +    |                             -----              ----
2019-10-02T17:39:57.9623313Z 17    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9623352Z + LL |         f
2019-10-02T17:39:57.9623352Z + LL |         f
2019-10-02T17:39:57.9623386Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9623469Z 19 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9623633Z -   --> $DIR/ref-self-async.rs:32:57
2019-10-02T17:39:57.9623807Z +   --> $DIR/ref-self-async.rs:33:9
2019-10-02T17:39:57.9623849Z 21    |
2019-10-02T17:39:57.9623849Z 21    |
2019-10-02T17:39:57.9624035Z 22 LL |     async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9624233Z -    |                                     -----               ^^^^
2019-10-02T17:39:57.9624414Z -    |                                     |                   |
2019-10-02T17:39:57.9624621Z -    |                                     |                   ...but data from `f` is returned here
2019-10-02T17:39:57.9624822Z +    |                                     -----               ----
2019-10-02T17:39:57.9624906Z 26    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9624961Z + LL |         f
2019-10-02T17:39:57.9624961Z + LL |         f
2019-10-02T17:39:57.9624997Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9625062Z 28 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9625251Z -   --> $DIR/ref-self-async.rs:36:57
2019-10-02T17:39:57.9625410Z +   --> $DIR/ref-self-async.rs:37:9
2019-10-02T17:39:57.9625445Z 30    |
2019-10-02T17:39:57.9625445Z 30    |
2019-10-02T17:39:57.9625641Z 31 LL |     async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9625826Z -    |                                     -----               ^^^^
2019-10-02T17:39:57.9626184Z -    |                                     |                   |
2019-10-02T17:39:57.9626820Z -    |                                     |                   ...but data from `f` is returned here
2019-10-02T17:39:57.9627084Z +    |                                     -----               ----
2019-10-02T17:39:57.9627217Z 35    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9627270Z + LL |         f
2019-10-02T17:39:57.9627270Z + LL |         f
2019-10-02T17:39:57.9627318Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9627438Z 37 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9627660Z -   --> $DIR/ref-self-async.rs:40:66
2019-10-02T17:39:57.9627874Z +   --> $DIR/ref-self-async.rs:41:9
2019-10-02T17:39:57.9627940Z 39    |
2019-10-02T17:39:57.9627940Z 39    |
2019-10-02T17:39:57.9628201Z 40 LL |     async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9628752Z -    |                                             -----                ^^^^
2019-10-02T17:39:57.9629028Z -    |                                             |                    |
2019-10-02T17:39:57.9629312Z -    |                                             |                    ...but data from `f` is returned here
2019-10-02T17:39:57.9629565Z +    |                                             -----                ----
2019-10-02T17:39:57.9629701Z 44    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9630052Z + LL |         f
2019-10-02T17:39:57.9630052Z + LL |         f
2019-10-02T17:39:57.9630103Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9630167Z 46 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9630384Z -   --> $DIR/ref-self-async.rs:44:66
2019-10-02T17:39:57.9630615Z +   --> $DIR/ref-self-async.rs:45:9
2019-10-02T17:39:57.9630658Z 48    |
2019-10-02T17:39:57.9630658Z 48    |
2019-10-02T17:39:57.9630889Z 49 LL |     async fn box_pin_ref_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9631080Z -    |                                             -----                ^^^^
2019-10-02T17:39:57.9631263Z -    |                                             |                    |
2019-10-02T17:39:57.9631484Z -    |                                             |                    ...but data from `f` is returned here
2019-10-02T17:39:57.9631675Z +    |                                             -----                ----
2019-10-02T17:39:57.9631782Z 53    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9631820Z + LL |         f
2019-10-02T17:39:57.9631820Z + LL |         f
2019-10-02T17:39:57.9631855Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9631943Z 55 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9632112Z -   --> $DIR/ref-self-async.rs:48:69
2019-10-02T17:39:57.9632269Z +   --> $DIR/ref-self-async.rs:49:9
2019-10-02T17:39:57.9632321Z 57    |
2019-10-02T17:39:57.9632321Z 57    |
2019-10-02T17:39:57.9632507Z 58 LL |     async fn wrap_ref_Self_Self(self: Wrap<&Self, Self>, f: &u8) -> &u8 {
2019-10-02T17:39:57.9632694Z -    |                                            -----                    ^^^
2019-10-02T17:39:57.9632896Z -    |                                            |                        |
2019-10-02T17:39:57.9633107Z -    |                                            |                        ...but data from `f` is returned here
2019-10-02T17:39:57.9633306Z +    |                                            -----                    ---
2019-10-02T17:39:57.9633414Z 62    |                                            this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9633452Z + LL |         f
2019-10-02T17:39:57.9633452Z + LL |         f
2019-10-02T17:39:57.9633504Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9633570Z 64 error: aborting due to 7 previous errors
2019-10-02T17:39:57.9633622Z 65 
2019-10-02T17:39:57.9633644Z 
2019-10-02T17:39:57.9633664Z 
2019-10-02T17:39:57.9633664Z 
2019-10-02T17:39:57.9633698Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9633944Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-self-async/ref-self-async.stderr
2019-10-02T17:39:57.9634129Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9634330Z To only update this specific test, also pass `--test-args self/elision/ref-self-async.rs`
2019-10-02T17:39:57.9634406Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9634441Z status: exit code: 1
2019-10-02T17:39:57.9634441Z status: exit code: 1
2019-10-02T17:39:57.9635211Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/self/elision/ref-self-async.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-self-async" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-self-async/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9635481Z ------------------------------------------
2019-10-02T17:39:57.9635584Z 
2019-10-02T17:39:57.9635784Z ------------------------------------------
2019-10-02T17:39:57.9635822Z stderr:
2019-10-02T17:39:57.9635822Z stderr:
2019-10-02T17:39:57.9636183Z ------------------------------------------
2019-10-02T17:39:57.9636224Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9636915Z   --> /checkout/src/test/ui/self/elision/ref-self-async.rs:23:9
2019-10-02T17:39:57.9637007Z    |
2019-10-02T17:39:57.9637302Z LL |     async fn ref_self(&self, f: &u32) -> &u32 { //~ ERROR lifetime mismatch
2019-10-02T17:39:57.9637535Z    |                       -----              ----
2019-10-02T17:39:57.9637662Z    |                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9637717Z LL |         f
2019-10-02T17:39:57.9637717Z LL |         f
2019-10-02T17:39:57.9637785Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9637861Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9638118Z   --> /checkout/src/test/ui/self/elision/ref-self-async.rs:29:9
2019-10-02T17:39:57.9638187Z    |
2019-10-02T17:39:57.9638187Z    |
2019-10-02T17:39:57.9638419Z LL |     async fn ref_Self(self: &Self, f: &u32) -> &u32 {
2019-10-02T17:39:57.9638650Z    |                             -----              ----
2019-10-02T17:39:57.9638785Z    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9638785Z    |                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9638841Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9638911Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9638987Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9639232Z   --> /checkout/src/test/ui/self/elision/ref-self-async.rs:33:9
2019-10-02T17:39:57.9639301Z    |
2019-10-02T17:39:57.9639301Z    |
2019-10-02T17:39:57.9639547Z LL |     async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9639952Z    |                                     -----               ----
2019-10-02T17:39:57.9640242Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9640242Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9640285Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9640504Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9640559Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9640761Z   --> /checkout/src/test/ui/self/elision/ref-self-async.rs:37:9
2019-10-02T17:39:57.9640798Z    |
2019-10-02T17:39:57.9640798Z    |
2019-10-02T17:39:57.9640974Z LL |     async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9641149Z    |                                     -----               ----
2019-10-02T17:39:57.9641246Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9641246Z    |                                     this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9641292Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9641345Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9641398Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9641600Z   --> /checkout/src/test/ui/self/elision/ref-self-async.rs:41:9
2019-10-02T17:39:57.9641637Z    |
2019-10-02T17:39:57.9641637Z    |
2019-10-02T17:39:57.9641824Z LL |     async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9642024Z    |                                             -----                ----
2019-10-02T17:39:57.9642108Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9642108Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9642166Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9642202Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9642355Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9642580Z   --> /checkout/src/test/ui/self/elision/ref-self-async.rs:45:9
2019-10-02T17:39:57.9642617Z    |
2019-10-02T17:39:57.9642617Z    |
2019-10-02T17:39:57.9642802Z LL |     async fn box_pin_ref_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9643065Z    |                                             -----                ----
2019-10-02T17:39:57.9643156Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9643156Z    |                                             this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9643213Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9643249Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9643303Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9643525Z   --> /checkout/src/test/ui/self/elision/ref-self-async.rs:49:9
2019-10-02T17:39:57.9643562Z    |
2019-10-02T17:39:57.9643562Z    |
2019-10-02T17:39:57.9643756Z LL |     async fn wrap_ref_Self_Self(self: Wrap<&Self, Self>, f: &u8) -> &u8 {
2019-10-02T17:39:57.9643959Z    |                                            -----                    ---
2019-10-02T17:39:57.9644049Z    |                                            this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9644049Z    |                                            this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9644106Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9644142Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9644198Z error: aborting due to 7 previous errors
2019-10-02T17:39:57.9644237Z 
2019-10-02T17:39:57.9644257Z 
2019-10-02T17:39:57.9644424Z ------------------------------------------
---
2019-10-02T17:39:57.9644772Z 1 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9644938Z -   --> $DIR/ref-struct-async.rs:13:52
2019-10-02T17:39:57.9645096Z +   --> $DIR/ref-struct-async.rs:14:9
2019-10-02T17:39:57.9645131Z 3    |
2019-10-02T17:39:57.9645324Z 4 LL |     async fn ref_Struct(self: &Struct, f: &u32) -> &u32 {
2019-10-02T17:39:57.9645506Z -    |                               -------              ^^^^
2019-10-02T17:39:57.9645683Z -    |                               |                    |
2019-10-02T17:39:57.9645901Z -    |                               |                    ...but data from `f` is returned here
2019-10-02T17:39:57.9646258Z +    |                               -------              ----
2019-10-02T17:39:57.9646672Z 8    |                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9646727Z + LL |         f
2019-10-02T17:39:57.9646727Z + LL |         f
2019-10-02T17:39:57.9646786Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9646895Z 10 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9647166Z -   --> $DIR/ref-struct-async.rs:17:61
2019-10-02T17:39:57.9647399Z +   --> $DIR/ref-struct-async.rs:18:9
2019-10-02T17:39:57.9647447Z 12    |
2019-10-02T17:39:57.9647447Z 12    |
2019-10-02T17:39:57.9647704Z 13 LL |     async fn box_ref_Struct(self: Box<&Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9647973Z -    |                                       -------               ^^^^
2019-10-02T17:39:57.9648219Z -    |                                       |                     |
2019-10-02T17:39:57.9648503Z -    |                                       |                     ...but data from `f` is returned here
2019-10-02T17:39:57.9648768Z +    |                                       -------               ----
2019-10-02T17:39:57.9648882Z 17    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9649070Z + LL |         f
2019-10-02T17:39:57.9649070Z + LL |         f
2019-10-02T17:39:57.9649118Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9649210Z 19 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9649481Z -   --> $DIR/ref-struct-async.rs:21:61
2019-10-02T17:39:57.9649777Z +   --> $DIR/ref-struct-async.rs:22:9
2019-10-02T17:39:57.9649834Z 21    |
2019-10-02T17:39:57.9649834Z 21    |
2019-10-02T17:39:57.9650300Z 22 LL |     async fn pin_ref_Struct(self: Pin<&Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9650492Z -    |                                       -------               ^^^^
2019-10-02T17:39:57.9650671Z -    |                                       |                     |
2019-10-02T17:39:57.9650891Z -    |                                       |                     ...but data from `f` is returned here
2019-10-02T17:39:57.9651079Z +    |                                       -------               ----
2019-10-02T17:39:57.9651185Z 26    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9651223Z + LL |         f
2019-10-02T17:39:57.9651223Z + LL |         f
2019-10-02T17:39:57.9651258Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9651346Z 28 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9651515Z -   --> $DIR/ref-struct-async.rs:25:70
2019-10-02T17:39:57.9651691Z +   --> $DIR/ref-struct-async.rs:26:9
2019-10-02T17:39:57.9651726Z 30    |
2019-10-02T17:39:57.9651726Z 30    |
2019-10-02T17:39:57.9651914Z 31 LL |     async fn box_box_ref_Struct(self: Box<Box<&Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9652103Z -    |                                               -------                ^^^^
2019-10-02T17:39:57.9652305Z -    |                                               |                      |
2019-10-02T17:39:57.9652517Z -    |                                               |                      ...but data from `f` is returned here
2019-10-02T17:39:57.9652714Z +    |                                               -------                ----
2019-10-02T17:39:57.9652821Z 35    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9652880Z + LL |         f
2019-10-02T17:39:57.9652880Z + LL |         f
2019-10-02T17:39:57.9652918Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9652984Z 37 error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9653170Z -   --> $DIR/ref-struct-async.rs:29:66
2019-10-02T17:39:57.9653329Z +   --> $DIR/ref-struct-async.rs:30:9
2019-10-02T17:39:57.9653364Z 39    |
2019-10-02T17:39:57.9653364Z 39    |
2019-10-02T17:39:57.9653566Z 40 LL |     async fn box_pin_Struct(self: Box<Pin<&Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9653749Z -    |                                           -------                ^^^^
2019-10-02T17:39:57.9653939Z -    |                                           |                      |
2019-10-02T17:39:57.9654165Z -    |                                           |                      ...but data from `f` is returned here
2019-10-02T17:39:57.9654350Z +    |                                           -------                ----
2019-10-02T17:39:57.9654456Z 44    |                                           this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9654494Z + LL |         f
2019-10-02T17:39:57.9654494Z + LL |         f
2019-10-02T17:39:57.9654528Z +    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9654613Z 46 error: aborting due to 5 previous errors
2019-10-02T17:39:57.9654645Z 47 
2019-10-02T17:39:57.9654665Z 
2019-10-02T17:39:57.9654702Z 
2019-10-02T17:39:57.9654702Z 
2019-10-02T17:39:57.9654736Z The actual stderr differed from the expected stderr.
2019-10-02T17:39:57.9655069Z Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-struct-async/ref-struct-async.stderr
2019-10-02T17:39:57.9655268Z To update references, rerun the tests and pass the `--bless` flag
2019-10-02T17:39:57.9655466Z To only update this specific test, also pass `--test-args self/elision/ref-struct-async.rs`
2019-10-02T17:39:57.9655603Z error: 1 errors occurred comparing output.
2019-10-02T17:39:57.9655654Z status: exit code: 1
2019-10-02T17:39:57.9655654Z status: exit code: 1
2019-10-02T17:39:57.9656381Z command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/self/elision/ref-struct-async.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-struct-async" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2018" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/self/elision/ref-struct-async/auxiliary" "-A" "unused"
2019-10-02T17:39:57.9656947Z ------------------------------------------
2019-10-02T17:39:57.9656983Z 
2019-10-02T17:39:57.9657224Z ------------------------------------------
2019-10-02T17:39:57.9657273Z stderr:
2019-10-02T17:39:57.9657273Z stderr:
2019-10-02T17:39:57.9657496Z ------------------------------------------
2019-10-02T17:39:57.9657564Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9657814Z   --> /checkout/src/test/ui/self/elision/ref-struct-async.rs:14:9
2019-10-02T17:39:57.9657868Z    |
2019-10-02T17:39:57.9658127Z LL |     async fn ref_Struct(self: &Struct, f: &u32) -> &u32 {
2019-10-02T17:39:57.9658366Z    |                               -------              ----
2019-10-02T17:39:57.9658495Z    |                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9658495Z    |                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9658560Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9658612Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9658707Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9658955Z   --> /checkout/src/test/ui/self/elision/ref-struct-async.rs:18:9
2019-10-02T17:39:57.9659005Z    |
2019-10-02T17:39:57.9659005Z    |
2019-10-02T17:39:57.9659278Z LL |     async fn box_ref_Struct(self: Box<&Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9659527Z    |                                       -------               ----
2019-10-02T17:39:57.9659658Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9659658Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9659713Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9659764Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9660025Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9660217Z   --> /checkout/src/test/ui/self/elision/ref-struct-async.rs:22:9
2019-10-02T17:39:57.9660254Z    |
2019-10-02T17:39:57.9660254Z    |
2019-10-02T17:39:57.9660451Z LL |     async fn pin_ref_Struct(self: Pin<&Struct>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9660630Z    |                                       -------               ----
2019-10-02T17:39:57.9660736Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9660736Z    |                                       this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9660776Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9660812Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9660884Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9661068Z   --> /checkout/src/test/ui/self/elision/ref-struct-async.rs:26:9
2019-10-02T17:39:57.9661121Z    |
2019-10-02T17:39:57.9661121Z    |
2019-10-02T17:39:57.9661308Z LL |     async fn box_box_ref_Struct(self: Box<Box<&Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9661619Z    |                                               -------                ----
2019-10-02T17:39:57.9661724Z    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9661724Z    |                                               this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9661833Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9661892Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9661947Z error[E0623]: lifetime mismatch
2019-10-02T17:39:57.9662151Z   --> /checkout/src/test/ui/self/elision/ref-struct-async.rs:30:9
2019-10-02T17:39:57.9662203Z    |
2019-10-02T17:39:57.9662203Z    |
2019-10-02T17:39:57.9662388Z LL |     async fn box_pin_Struct(self: Box<Pin<&Struct>>, f: &u32) -> &u32 {
2019-10-02T17:39:57.9662572Z    |                                           -------                ----
2019-10-02T17:39:57.9662680Z    |                                           this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9662680Z    |                                           this parameter and the return type are declared with different lifetimes...
2019-10-02T17:39:57.9662720Z LL |         f //~^ ERROR lifetime mismatch
2019-10-02T17:39:57.9662776Z    |         ^ ...but data from `f` is returned here
2019-10-02T17:39:57.9662837Z error: aborting due to 5 previous errors
2019-10-02T17:39:57.9662860Z 
2019-10-02T17:39:57.9662880Z 
2019-10-02T17:39:57.9663063Z ------------------------------------------
---
2019-10-02T17:39:57.9665533Z thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:537:22
2019-10-02T17:39:57.9665579Z note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
2019-10-02T17:39:57.9665620Z 
2019-10-02T17:39:57.9665640Z 
2019-10-02T17:39:57.9667255Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "ui" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-6.0/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "6.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
2019-10-02T17:39:57.9667652Z 
2019-10-02T17:39:57.9667761Z 
2019-10-02T17:39:57.9667818Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
2019-10-02T17:39:57.9667892Z Build completed unsuccessfully in 0:59:27
2019-10-02T17:39:57.9667892Z Build completed unsuccessfully in 0:59:27
2019-10-02T17:39:57.9667944Z == clock drift check ==
2019-10-02T17:39:57.9668052Z   local time: Wed Oct  2 17:39:57 UTC 2019
2019-10-02T17:39:58.0495872Z   network time: Wed, 02 Oct 2019 17:39:58 GMT
2019-10-02T17:39:58.0500074Z == end clock drift check ==
2019-10-02T17:39:59.0100888Z ##[error]Bash exited with code '1'.
2019-10-02T17:39:59.0144341Z ##[section]Starting: Checkout
2019-10-02T17:39:59.0146162Z ==============================================================================
2019-10-02T17:39:59.0146391Z Task         : Get sources
2019-10-02T17:39:59.0146646Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

@nikomatsakis
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@Centril

r=me if you like with comments addressed.

(with respect, you're not presently a compiler reviewer)

@cramertj
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cramertj commented Oct 2, 2019

r=me with travis.

@nikomatsakis
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@bors r=cramertj

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bors commented Oct 2, 2019

📌 Commit a96bce7 has been approved by cramertj

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 2, 2019
@nikomatsakis
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@bors r-

forgot to add test @Centril requested

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 3, 2019
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@bors r=cramertj

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bors commented Oct 3, 2019

📌 Commit a807032 has been approved by cramertj

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Oct 3, 2019
@nikomatsakis
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Should we p=1 this? (I wonder if p=1 should be general policy for beta-nominated PRs)

(My reasoning is that if we are considering a backport, we want it on nightly ASAP to know about possible complications.)

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Centril commented Oct 3, 2019 •
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I'll just include it in the next rollup which is even faster than p=1. ;)

EDIT: ...and done... see below. :)

Centril added a commit to Centril/rust that referenced this pull request Oct 3, 2019
@Centril
Rollup merge of rust-lang#64999 - nikomatsakis:issue-60424-async-retu…
f7aa421 
…rn-inference, r=cramertj

extract expected return type for async fn generators

Fixes rust-lang#60424

cc @Centril, I know you've been eager to see this fixed.

r? @cramertj
@Centril Centril mentioned this pull request Oct 3, 2019
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Centril added a commit to Centril/rust that referenced this pull request Oct 3, 2019
@Centril
Rollup merge of rust-lang#64999 - nikomatsakis:issue-60424-async-retu…
83adae8 
…rn-inference, r=cramertj

extract expected return type for async fn generators

Fixes rust-lang#60424

cc @Centril, I know you've been eager to see this fixed.

r? @cramertj
@Centril Centril mentioned this pull request Oct 3, 2019
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bors added a commit that referenced this pull request Oct 3, 2019
@bors
Auto merge of #65053 - Centril:rollup-nwp0wgf, r=Centril
c049e10 
Rollup of 5 pull requests

Successful merges:

 - #64690 (proc_macro API: Expose `macro_rules` hygiene)
 - #64749 (Fix most remaining Polonius test differences)
 - #64938 (Avoid ICE on ReFree region on where clause)
 - #64999 (extract expected return type for async fn generators)
 - #65037 (`#[track_caller]` feature gate (RFC 2091))

Failed merges:

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Centril commented Oct 3, 2019

@bors p=3 (canary for seeing cause of failure in #65053 (comment))

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bors commented Oct 3, 2019

⌛ Testing commit a807032 with merge cfb6d84...

bors added a commit that referenced this pull request Oct 3, 2019
@bors
Auto merge of #64999 - nikomatsakis:issue-60424-async-return-inferenc…
cfb6d84 
…e, r=cramertj

extract expected return type for async fn generators

Fixes #60424

cc @Centril, I know you've been eager to see this fixed.

r? @cramertj
eddyb
eddyb reviewed Oct 3, 2019
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src/librustc_typeck/check/closure.rs
/// type of the `async fn` -- that is, the return type that the
/// user specified. The "desugared" return type is a `impl
/// Future<Output = T>`, so we do this by searching through the
/// obligations to extract the `T`.
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@eddyb eddyb Oct 3, 2019 •
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Maybe leave a FIXME/open an issue somewhere about generalizing this so it can rely entirely on the impls involved and not have to know about the Future trait at all?
(This would be long-term and probably significantly more complicated than this targeted fix)

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bors commented Oct 3, 2019

☀️ Test successful - checks-azure
Approved by: cramertj
Pushing cfb6d84 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 3, 2019
@bors bors merged commit a807032 into rust-lang:master Oct 3, 2019
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@pnkfelix
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pnkfelix commented Oct 3, 2019

discussed at rustc meeting. we're going to leave it beta-nominated for another week so that it gets exercised a bit on nightly before we jump in.

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Centril commented Oct 6, 2019

Seems this PR introduced #65159.

@nikomatsakis
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If we do backport, we would want to backport #65235 too

@pnkfelix
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T-compiler discussed. Decided to let this ride-the-trains.

declined for beta-backport.

(For future github readers: If you need a work-around, its documented in description on #60424)

@pnkfelix pnkfelix removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Oct 10, 2019
@Centril Centril mentioned this pull request Oct 17, 2019
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@jxs jxs mentioned this pull request Nov 13, 2019
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@JohnTitor JohnTitor mentioned this pull request Nov 2, 2020
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type inference doesn't work in async fn that return Box<dyn SomeTrait>
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