-
Notifications
You must be signed in to change notification settings - Fork 12.8k
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Correctly check never_type
feature gating
#120552
Conversation
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Can you check if this also works for RPIT? Or dyn Fn() -> !
?
Also, instead of keeping this "in generics" state as part of the visitor, please just modify this line to check for |
This will also likely require a beta backport depending on the timing of when this lands. I'll nominate it pre-emptively so we don't forget. This should be backported to 1.77, so if this lands on 1.77 then we're good. |
Except this is the "default" implementation. It should call the |
Yes, I understand clearly what the problem is. There's a discrepancy between what I don't understand what point you're trying to make here though -- there's still no reason to introduce For the record, the approach that you've taken also breaks this code which compiles on stable: trait X<const N: i32> {}
fn hello<T: X<{ fn hello() -> ! { loop {} } 1 }>>() {}
fn main() {} |
Then I misunderstood what you meant. I understood that you said to revert the change on this line and to add a code comment. However, this would not only impact |
Actually, that's not the right line that I suggested anyways. Just modify the The manual tracking of a boolean in a walker imo is an anti-pattern, because it's very easy to get wrong with nested items and other AST nodes. |
No I'm fine with doing it. Just didn't understand what you meant. |
e450f16
to
aee9d60
Compare
Applied your suggestions. Added more ui tests and also the case which should work. |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
r=me after applying changes
@@ -362,6 +362,16 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> { | |||
} | |||
} | |||
|
|||
fn visit_generic_args(&mut self, args: &'a ast::GenericArgs) { | |||
if let ast::GenericArgs::Parenthesized(generic_args) = args |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
pls leave a comment explaining why this is being checked here
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Good point!
tests/ui/never_type/const-context.rs
Outdated
|
||
trait X<const N: i32> {} | ||
|
||
fn hello<T: X<{ fn hello() -> ! { loop {} } 1 }>>() {} |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
could you rename this? it's not really that it's in a "const context", it's more about it being in a nested item.
Maybe never-type-in-nested-fn-decl
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
👍
aee9d60
to
0f21e45
Compare
@bors r=compiler-errors |
🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened. |
…gate, r=compiler-errors Correctly check `never_type` feature gating Fixes rust-lang#120542. The feature wasn't tested on return type of a generic function type, so it got under the radar in rust-lang#120316. r? `@compiler-errors`
…gate, r=compiler-errors Correctly check `never_type` feature gating Fixes rust-lang#120542. The feature wasn't tested on return type of a generic function type, so it got under the radar in rust-lang#120316. r? ``@compiler-errors``
…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#119759 (Add FileCheck annotations to dataflow-const-prop tests) - rust-lang#120323 (On E0277 be clearer about implicit `Sized` bounds on type params and assoc types) - rust-lang#120473 (Only suggest removal of `as_*` and `to_` conversion methods on E0308) - rust-lang#120520 (Some cleanups around diagnostic levels.) - rust-lang#120540 (add test for try-block-in-match-arm) - rust-lang#120547 (`#![feature(inline_const_pat)]` is no longer incomplete) - rust-lang#120552 (Correctly check `never_type` feature gating) - rust-lang#120555 (put pnkfelix (me) back on the review queue.) - rust-lang#120556 (Improve the diagnostics for unused generic parameters) r? `@ghost` `@rustbot` modify labels: rollup
…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#119759 (Add FileCheck annotations to dataflow-const-prop tests) - rust-lang#120323 (On E0277 be clearer about implicit `Sized` bounds on type params and assoc types) - rust-lang#120473 (Only suggest removal of `as_*` and `to_` conversion methods on E0308) - rust-lang#120520 (Some cleanups around diagnostic levels.) - rust-lang#120540 (add test for try-block-in-match-arm) - rust-lang#120547 (`#![feature(inline_const_pat)]` is no longer incomplete) - rust-lang#120552 (Correctly check `never_type` feature gating) - rust-lang#120555 (put pnkfelix (me) back on the review queue.) - rust-lang#120556 (Improve the diagnostics for unused generic parameters) r? `@ghost` `@rustbot` modify labels: rollup
…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#119759 (Add FileCheck annotations to dataflow-const-prop tests) - rust-lang#120323 (On E0277 be clearer about implicit `Sized` bounds on type params and assoc types) - rust-lang#120473 (Only suggest removal of `as_*` and `to_` conversion methods on E0308) - rust-lang#120540 (add test for try-block-in-match-arm) - rust-lang#120547 (`#![feature(inline_const_pat)]` is no longer incomplete) - rust-lang#120552 (Correctly check `never_type` feature gating) - rust-lang#120555 (put pnkfelix (me) back on the review queue.) - rust-lang#120556 (Improve the diagnostics for unused generic parameters) r? `@ghost` `@rustbot` modify labels: rollup
Rollup merge of rust-lang#120552 - GuillaumeGomez:never-type-feature-gate, r=compiler-errors Correctly check `never_type` feature gating Fixes rust-lang#120542. The feature wasn't tested on return type of a generic function type, so it got under the radar in rust-lang#120316. r? ```@compiler-errors```
[beta] backports - Correct paths for hexagon-unknown-none-elf platform doc rust-lang#120533 - CI: Use ninja on apple builders rust-lang#120543 - Correctly check `never_type` feature gating rust-lang#120552 - Revert unsound libcore changes of 119911 rust-lang#120562 r? cuviper
[beta] backports - Correct paths for hexagon-unknown-none-elf platform doc rust-lang#120533 - CI: Use ninja on apple builders rust-lang#120543 - Correctly check `never_type` feature gating rust-lang#120552 - Revert unsound libcore changes of 119911 rust-lang#120562 r? cuviper
[beta] backports - Correct paths for hexagon-unknown-none-elf platform doc rust-lang#120533 - CI: Use ninja on apple builders rust-lang#120543 - Correctly check `never_type` feature gating rust-lang#120552 - Revert unsound libcore changes of 119911 rust-lang#120562 - Downgrade xcode rust-lang#120914 r? cuviper
[beta] backports - Correct paths for hexagon-unknown-none-elf platform doc rust-lang#120533 - CI: Use ninja on apple builders rust-lang#120543 - Correctly check `never_type` feature gating rust-lang#120552 - Revert unsound libcore changes of 119911 rust-lang#120562 - Downgrade xcode rust-lang#120914 - Update jobserver-rs to 0.1.28 rust-lang#120846 - [beta] Update LLVM submodule rust-lang#121132 r? cuviper
Fixes #120542.
The feature wasn't tested on return type of a generic function type, so it got under the radar in #120316.
r? @compiler-errors