diff options
Diffstat (limited to 'src/test/ui/traits/issue-43132.rs')
-rw-r--r-- | src/test/ui/traits/issue-43132.rs | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/test/ui/traits/issue-43132.rs b/src/test/ui/traits/issue-43132.rs new file mode 100644 index 000000000..c886f4b0a --- /dev/null +++ b/src/test/ui/traits/issue-43132.rs @@ -0,0 +1,65 @@ +// run-pass +#![allow(unused)] + +fn main() { +} + +fn foo() { + let b = mk::< + Forward<(Box<dyn Future<Error = u32>>,)>, + >(); + b.map_err(|_| ()).join(); +} + +fn mk<T>() -> T { + loop {} +} + +impl<I: Future<Error = E>, E> Future for (I,) { + type Error = E; +} + +struct Forward<T: Future> { + _a: T, +} + +impl<T: Future> Future for Forward<T> +where + T::Error: From<u32>, +{ + type Error = T::Error; +} + +trait Future { + type Error; + + fn map_err<F, E>(self, _: F) -> (Self, F) + where + F: FnOnce(Self::Error) -> E, + Self: Sized, + { + loop {} + } + + fn join(self) -> (MaybeDone<Self>, ()) + where + Self: Sized, + { + loop {} + } +} + +impl<S: ?Sized + Future> Future for Box<S> { + type Error = S::Error; +} + +enum MaybeDone<A: Future> { + _Done(A::Error), +} + +impl<U, A: Future, F> Future for (A, F) +where + F: FnOnce(A::Error) -> U, +{ + type Error = U; +} |