diff options
Diffstat (limited to 'tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs')
-rw-r--r-- | tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs b/tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs new file mode 100644 index 000000000..2a2be6b74 --- /dev/null +++ b/tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs @@ -0,0 +1,26 @@ +#![feature(type_alias_impl_trait)] + +#[derive(Clone)] +struct CopyIfEq<T, U>(T, U); + +impl<T: Copy> Copy for CopyIfEq<T, T> {} + +type E<'a, 'b> = impl Sized; + +fn foo<'a: 'b, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> { + let v = CopyIfEq::<*mut _, *mut _>(&mut { x }, &mut y); + + // This assignment requires that `x` and `y` have the same type due to the + // `Copy` impl. The reason why we are using a copy to create a constraint + // is that only borrow checking (not regionck in type checking) enforces + // this bound. + let u = v; + let _: *mut &'a i32 = u.1; + unsafe { + let _: &'b i32 = *u.0; + } + u.0 + //~^ ERROR hidden type for `E<'b, 'c>` captures lifetime that does not appear in bounds +} + +fn main() {} |