Add From<E: Error + Send> for Box<dyn Error + Send> impl #73878

roblabla · 2020-06-30T00:15:15Z

Adds the following implementation:

 impl<'a, E: Error + Send + 'a> From<E> for Box<dyn Error + Send + 'a>;

Partially fixes #62824

Said issue also mentions adding an impl<'a, E: Error + Sync + 'a> From<E> for Box<dyn Error + Sync + 'a> {}, but I doubt its usefulness. AFAIK, a type that is Sync + !Send is extremely rare/shouldn't happen. Thus, Send + Sync and Sync are much the same.

rust-highfive · 2020-06-30T00:15:18Z

r? @joshtriplett

(rust_highfive has picked a reviewer for you, use r? to override)

joshtriplett · 2020-06-30T00:37:20Z

This seems reasonable, but someone from @rust-lang/libs needs to review it.

Also, you need to update tests.

rust-highfive · 2020-06-30T01:31:26Z

The job x86_64-gnu-llvm-8 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.

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##[section]Starting: Checkout rust-lang/rust@refs/pull/73878/merge to s
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Author       : Microsoft
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---
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---- [ui] ui/const-generics/array-impls/alloc-types-no-impls-length-33.rs stdout ----
diff of stderr:

18              <std::boxed::Box<(dyn std::error::Error + 'static)> as std::convert::From<&str>>
19              <std::boxed::Box<(dyn std::error::Error + 'static)> as std::convert::From<std::borrow::Cow<'a, str>>>
20              <std::boxed::Box<(dyn std::error::Error + 'static)> as std::convert::From<std::string::String>>
+            and 23 others
22    = note: required because of the requirements on the impl of `std::convert::Into<std::boxed::Box<[i32; 33]>>` for `std::boxed::Box<[i32]>`
22    = note: required because of the requirements on the impl of `std::convert::Into<std::boxed::Box<[i32; 33]>>` for `std::boxed::Box<[i32]>`
23    = note: required because of the requirements on the impl of `std::convert::TryFrom<std::boxed::Box<[i32]>>` for `std::boxed::Box<[i32; 33]>`


The actual stderr differed from the expected stderr.
The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/const-generics/array-impls/alloc-types-no-impls-length-33/alloc-types-no-impls-length-33.stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args const-generics/array-impls/alloc-types-no-impls-length-33.rs`
error: 1 errors occurred comparing output.
status: exit code: 1
status: exit code: 1
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/const-generics/array-impls/alloc-types-no-impls-length-33.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/const-generics/array-impls/alloc-types-no-impls-length-33" "-A" "unused" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/const-generics/array-impls/alloc-types-no-impls-length-33/auxiliary"
------------------------------------------

------------------------------------------
stderr:
stderr:
------------------------------------------
error[E0277]: arrays only have std trait implementations for lengths 0..=32
  --> /checkout/src/test/ui/const-generics/array-impls/alloc-types-no-impls-length-33.rs:6:29
   |
LL |     let v: Vec<_> = [0; 33].into();
   |                             ^^^^ the trait `std::array::LengthAtMost32` is not implemented for `[{integer}; 33]`
   |
   = note: required because of the requirements on the impl of `std::convert::From<[{integer}; 33]>` for `std::vec::Vec<{integer}>`
   = note: required because of the requirements on the impl of `std::convert::Into<std::vec::Vec<{integer}>>` for `[{integer}; 33]`

error[E0277]: the trait bound `std::boxed::Box<[i32; 33]>: std::convert::From<std::boxed::Box<[i32]>>` is not satisfied
   |
   |
LL |     let boxed_array = <Box<[i32; 33]>>::try_from(boxed_slice);
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::From<std::boxed::Box<[i32]>>` is not implemented for `std::boxed::Box<[i32; 33]>`
   = help: the following implementations were found:
   = help: the following implementations were found:
             <std::boxed::Box<(dyn std::error::Error + 'a)> as std::convert::From<E>>
             <std::boxed::Box<(dyn std::error::Error + 'static)> as std::convert::From<&str>>
             <std::boxed::Box<(dyn std::error::Error + 'static)> as std::convert::From<std::borrow::Cow<'a, str>>>
             <std::boxed::Box<(dyn std::error::Error + 'static)> as std::convert::From<std::string::String>>
   = note: required because of the requirements on the impl of `std::convert::Into<std::boxed::Box<[i32; 33]>>` for `std::boxed::Box<[i32]>`
   = note: required because of the requirements on the impl of `std::convert::Into<std::boxed::Box<[i32; 33]>>` for `std::boxed::Box<[i32]>`
   = note: required because of the requirements on the impl of `std::convert::TryFrom<std::boxed::Box<[i32]>>` for `std::boxed::Box<[i32; 33]>`
error[E0277]: arrays only have std trait implementations for lengths 0..=32
  --> /checkout/src/test/ui/const-generics/array-impls/alloc-types-no-impls-length-33.rs:15:42
   |
   |
LL |     let boxed_slice = <Box<[i32]>>::from([0; 33]);
   |                                          |
   |                                          |
   |                                          expected an implementor of trait `std::convert::From<[{integer}; 33]>`
   |
   |
   = note: the trait bound `[i32; 33]: std::convert::From<[{integer}; 33]>` is not satisfied
   = note: required because of the requirements on the impl of `std::convert::From<[i32; 33]>` for `std::boxed::Box<[i32]>`


error[E0277]: the trait bound `std::boxed::Box<[i32; 33]>: std::convert::TryFrom<std::boxed::Box<[i32]>>` is not satisfied
   |
   |
LL |     let boxed_array = <Box<[i32; 33]>>::try_from(boxed_slice);
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::TryFrom<std::boxed::Box<[i32]>>` is not implemented for `std::boxed::Box<[i32; 33]>`
   = help: the following implementations were found:
   = help: the following implementations were found:
             <std::boxed::Box<[T; N]> as std::convert::TryFrom<std::boxed::Box<[T]>>>

error[E0277]: the trait bound `std::rc::Rc<[i32; 33]>: std::convert::From<std::rc::Rc<[i32]>>` is not satisfied
   |
   |
LL |     let boxed_array = <Rc<[i32; 33]>>::try_from(boxed_slice);
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::From<std::rc::Rc<[i32]>>` is not implemented for `std::rc::Rc<[i32; 33]>`
   = help: the following implementations were found:
   = help: the following implementations were found:
             <std::rc::Rc<B> as std::convert::From<std::borrow::Cow<'a, B>>>
             <std::rc::Rc<T> as std::convert::From<T>>
             <std::rc::Rc<T> as std::convert::From<std::boxed::Box<T>>>
             <std::rc::Rc<[T]> as std::convert::From<&[T]>>
           and 9 others
   = note: required because of the requirements on the impl of `std::convert::Into<std::rc::Rc<[i32; 33]>>` for `std::rc::Rc<[i32]>`
   = note: required because of the requirements on the impl of `std::convert::TryFrom<std::rc::Rc<[i32]>>` for `std::rc::Rc<[i32; 33]>`

error[E0277]: the trait bound `std::rc::Rc<[i32; 33]>: std::convert::TryFrom<std::rc::Rc<[i32]>>` is not satisfied
   |
   |
LL |     let boxed_array = <Rc<[i32; 33]>>::try_from(boxed_slice);
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::TryFrom<std::rc::Rc<[i32]>>` is not implemented for `std::rc::Rc<[i32; 33]>`
   = help: the following implementations were found:
   = help: the following implementations were found:
             <std::rc::Rc<[T; N]> as std::convert::TryFrom<std::rc::Rc<[T]>>>

error[E0277]: the trait bound `std::sync::Arc<[i32; 33]>: std::convert::From<std::sync::Arc<[i32]>>` is not satisfied
   |
   |
LL |     let boxed_array = <Arc<[i32; 33]>>::try_from(boxed_slice);
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::From<std::sync::Arc<[i32]>>` is not implemented for `std::sync::Arc<[i32; 33]>`
   = help: the following implementations were found:
   = help: the following implementations were found:
             <std::sync::Arc<B> as std::convert::From<std::borrow::Cow<'a, B>>>
             <std::sync::Arc<T> as std::convert::From<T>>
             <std::sync::Arc<T> as std::convert::From<std::boxed::Box<T>>>
             <std::sync::Arc<[T]> as std::convert::From<&[T]>>
           and 9 others
   = note: required because of the requirements on the impl of `std::convert::Into<std::sync::Arc<[i32; 33]>>` for `std::sync::Arc<[i32]>`
   = note: required because of the requirements on the impl of `std::convert::TryFrom<std::sync::Arc<[i32]>>` for `std::sync::Arc<[i32; 33]>`

error[E0277]: the trait bound `std::sync::Arc<[i32; 33]>: std::convert::TryFrom<std::sync::Arc<[i32]>>` is not satisfied
   |
   |
LL |     let boxed_array = <Arc<[i32; 33]>>::try_from(boxed_slice);
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::TryFrom<std::sync::Arc<[i32]>>` is not implemented for `std::sync::Arc<[i32; 33]>`
   = help: the following implementations were found:
   = help: the following implementations were found:
             <std::sync::Arc<[T; N]> as std::convert::TryFrom<std::sync::Arc<[T]>>>
error: aborting due to 8 previous errors

For more information about this error, try `rustc --explain E0277`.

---
thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:344:22
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


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-8/bin/FileCheck" "--nodejs" "/usr/bin/node" "--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" "8.0.0" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"


failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test --exclude src/tools/tidy
Build completed unsuccessfully in 1:11:12
Build completed unsuccessfully in 1:11:12
== clock drift check ==
  local time: Tue Jun 30 01:31:20 UTC 2020
  network time: Tue, 30 Jun 2020 01:31:20 GMT
== end clock drift check ==

##[error]Bash exited with code '1'.
##[section]Finishing: Run build
##[section]Starting: Checkout rust-lang/rust@refs/pull/73878/merge to s
Task         : Get sources
Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
Version      : 1.0.0
Author       : Microsoft
Author       : Microsoft
Help         : [More Information](https://go.microsoft.com/fwlink/?LinkId=798199)
==============================================================================
Cleaning any cached credential from repository: rust-lang/rust (GitHub)
##[section]Finishing: Checkout rust-lang/rust@refs/pull/73878/merge to s
Cleaning up task key
Start cleaning up orphan processes.
Terminate orphan process: pid (3890) (python)
##[section]Finishing: Finalize Job

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roblabla · 2020-06-30T13:55:47Z

Yeah I'm on it (currently waiting for rust to compile, which is taking ages on my slow machine).

To make Box<dyn Error + Send> more consistent, I think the following impls should be added as well:

impl From<String> for Box<dyn Error + Send> {}
impl<'a> From<&str> for Box<dyn Error + Send + 'a> {}
impl<'a, 'b> From<Cow<'a, str>> for Box<dyn Error + Send + 'b> {}

On that note, I'm having a hard time understanding the lifetimes here... Take the following two impls:

impl From<&str> for Box<dyn Error>;
impl<'a> From<&str> for Box<dyn Error + Send + Sync + 'a>;

What's 'a? The only lifetime I can think of that makes sense here is 'static. And why are the two impls inconsistent in their lifetime usages?

bors · 2020-07-26T07:45:50Z

☔ The latest upstream changes (presumably #74060) made this pull request unmergeable. Please resolve the merge conflicts.

rodrimati1992 · 2020-07-26T18:49:30Z

a type that is Sync + !Send is extremely rare/shouldn't happen

Well,there's MutexGuard , RwLockReadGuard , and RwLockWriteGuard ,which I guess are rare. I also don't know how often they'd be put inside an error type.

Dylan-DPC-zz · 2020-08-13T23:19:03Z

going to close this pr due to inactivity. If you wish, and you have a fix that resolves the error above you can submit a new pull request, and we'll take it from there. Thanks for taking the time to contribute :)

Add From<E: Error + Send> for Box<dyn Error + Send> impl

3597d0d

roblabla force-pushed the box-error-send-impl branch from 28698df to 3597d0d Compare June 30, 2020 00:15

rust-highfive assigned joshtriplett Jun 30, 2020

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 30, 2020

jonas-schievink added needs-fcp This change is insta-stable, so needs a completed FCP to proceed. relnotes Marks issues that should be documented in the release notes of the next release. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. labels Jun 30, 2020

jonas-schievink added this to the 1.46 milestone Jun 30, 2020

Fix tests

72b9c7c

Dylan-DPC-zz modified the milestones: 1.46, 1.47 Jul 18, 2020

Muirrum 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-review Status: Awaiting review from the assignee but also interested parties. labels Aug 13, 2020

Dylan-DPC-zz closed this Aug 13, 2020

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Add From<E: Error + Send> for Box<dyn Error + Send> impl #73878

Add From<E: Error + Send> for Box<dyn Error + Send> impl #73878

roblabla commented Jun 30, 2020 •

edited

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rust-highfive commented Jun 30, 2020

roblabla commented Jun 30, 2020

bors commented Jul 26, 2020

rodrimati1992 commented Jul 26, 2020

Dylan-DPC-zz commented Aug 13, 2020

Add From<E: Error + Send> for Box<dyn Error + Send> impl #73878

Add From<E: Error + Send> for Box<dyn Error + Send> impl #73878

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roblabla commented Jun 30, 2020 • edited Loading

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rust-highfive commented Jun 30, 2020

roblabla commented Jun 30, 2020

bors commented Jul 26, 2020

rodrimati1992 commented Jul 26, 2020

Dylan-DPC-zz commented Aug 13, 2020

roblabla commented Jun 30, 2020 •

edited

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