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Diffstat (limited to 'src/test/ui/nll/closure-requirements/propagate-from-trait-match.rs')
-rw-r--r-- | src/test/ui/nll/closure-requirements/propagate-from-trait-match.rs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/test/ui/nll/closure-requirements/propagate-from-trait-match.rs b/src/test/ui/nll/closure-requirements/propagate-from-trait-match.rs new file mode 100644 index 000000000..3bdb54339 --- /dev/null +++ b/src/test/ui/nll/closure-requirements/propagate-from-trait-match.rs @@ -0,0 +1,49 @@ +// 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| { + //~^ ERROR the parameter type `T` may not live long enough + + // This function call requires that + // + // (a) T: Trait<'a> + // + // and + // + // (b) T: 'a + // + // The latter does not hold. + + require(value); + }); +} + +fn main() {} |