never_patterns: typecheck never patterns #120009
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
rustbot
added
S-waiting-on-review
5 tasks
fmease
reviewed
Jan 16, 2024
compiler-errors
approved these changes
Jan 18, 2024
| @@ -178,8 +178,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { | |||
|
|
|||
| let ty = match pat.kind { | |||
| PatKind::Wild => expected, | |||
| // FIXME(never_patterns): check the type is uninhabited. If that is not possible within | |||
| // typeck, do that in a later phase. | |||
| // We allow any type here; we ensure that the type is uninhabited during match checking. | |||
There was a problem hiding this comment.
👍 I believe this is the right way to do it, since inhabitedness can cause cycles.
|
@bors r+ |
bors
added
S-waiting-on-bors
|
☔ The latest upstream changes (presumably #120089) made this pull request unmergeable. Please resolve the merge conflicts. |
bors
added
S-waiting-on-author
Nadrieril
force-pushed
the
never_patterns_tyck
branch
from
6d16655
to
ff6fa67
Compare
|
The conflict was on the typeck comment x) @bors r=compiler-errors |
bors
added
S-waiting-on-bors
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Jan 19, 2024
…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#117561 (Stabilize `slice_first_last_chunk`) - rust-lang#117662 ([rustdoc] Allows links in headings) - rust-lang#119815 (Format sources into the error message when loading codegen backends) - rust-lang#119835 (Exhaustiveness: simplify empty pattern logic) - rust-lang#119984 (Change return type of unstable `Waker::noop()` from `Waker` to `&Waker`.) - rust-lang#120009 (never_patterns: typecheck never patterns) - rust-lang#120122 (Don't add needs-triage to A-diagnostics) - rust-lang#120126 (Suggest `.swap()` when encountering conflicting borrows from `mem::swap` on a slice) - rust-lang#120134 (Restrict access to the private field of newtype indexes) Failed merges: - rust-lang#119968 (Remove unused/unnecessary features) r? `@ghost` `@rustbot` modify labels: rollup
bors
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Jan 20, 2024
…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#117561 (Stabilize `slice_first_last_chunk`) - rust-lang#117662 ([rustdoc] Allows links in headings) - rust-lang#119815 (Format sources into the error message when loading codegen backends) - rust-lang#119835 (Exhaustiveness: simplify empty pattern logic) - rust-lang#119984 (Change return type of unstable `Waker::noop()` from `Waker` to `&Waker`.) - rust-lang#120009 (never_patterns: typecheck never patterns) - rust-lang#120122 (Don't add needs-triage to A-diagnostics) - rust-lang#120126 (Suggest `.swap()` when encountering conflicting borrows from `mem::swap` on a slice) - rust-lang#120134 (Restrict access to the private field of newtype indexes) Failed merges: - rust-lang#119968 (Remove unused/unnecessary features) r? `@ghost` `@rustbot` modify labels: rollup
rust-timer
added a commit
to rust-lang-ci/rust
that referenced
this pull request
Jan 20, 2024
Rollup merge of rust-lang#120009 - Nadrieril:never_patterns_tyck, r=compiler-errors never_patterns: typecheck never patterns This checks that a `!` pattern is only used on an uninhabited type (modulo match ergonomics, i.e. `!` is allowed on `&Void`). r? `@compiler-errors`
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This checks that a
!pattern is only used on an uninhabited type (modulo match ergonomics, i.e.!is allowed on&Void).r? @compiler-errors