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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/nll/closure-requirements/propagate-from-trait-match.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/nll/closure-requirements/propagate-from-trait-match.rs')
-rw-r--r-- | tests/ui/nll/closure-requirements/propagate-from-trait-match.rs | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/nll/closure-requirements/propagate-from-trait-match.rs b/tests/ui/nll/closure-requirements/propagate-from-trait-match.rs new file mode 100644 index 000000000..cda781d8e --- /dev/null +++ b/tests/ui/nll/closure-requirements/propagate-from-trait-match.rs @@ -0,0 +1,48 @@ +// Test that regions which appear only in the closure's generics (in +// this case, `'a`) are properly mapped to the creator's generics. In +// this case, the closure constrains its type parameter `T` to outlive +// the same `'a` for which it implements `Trait`, which can only be the `'a` +// from the function definition. + +// compile-flags:-Zverbose + +#![feature(rustc_attrs)] +#![allow(dead_code)] + +trait Trait<'a> {} + +fn establish_relationships<T, F>(value: T, closure: F) +where + F: FnOnce(T), +{ + closure(value) +} + +fn require<'a, T>(t: T) +where + T: Trait<'a> + 'a, +{ +} + +#[rustc_regions] +fn supply<'a, T>(value: T) +where + T: Trait<'a>, +{ + establish_relationships(value, |value| { + // This function call requires that + // + // (a) T: Trait<'a> + // + // and + // + // (b) T: 'a + // + // The latter does not hold. + + require(value); + //~^ ERROR the parameter type `T` may not live long enough + }); +} + +fn main() {} |