diff options
Diffstat (limited to 'src/test/ui/associated-types/issue-47139-1.rs')
-rw-r--r-- | src/test/ui/associated-types/issue-47139-1.rs | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/src/test/ui/associated-types/issue-47139-1.rs b/src/test/ui/associated-types/issue-47139-1.rs deleted file mode 100644 index c55fc3434..000000000 --- a/src/test/ui/associated-types/issue-47139-1.rs +++ /dev/null @@ -1,78 +0,0 @@ -// run-pass -// Regression test for issue #47139: -// -// Coherence was encountering an (unnecessary) overflow trying to -// decide if the two impls of dummy overlap. -// -// The overflow went something like: -// -// - `&'a ?T: Insertable` ? -// - let ?T = Option<?U> ? -// - `Option<?U>: Insertable` ? -// - `Option<&'a ?U>: Insertable` ? -// - `&'a ?U: Insertable` ? -// -// While somewhere in the middle, a projection would occur, which -// broke cycle detection. -// -// It turned out that this cycle was being kicked off due to some -// extended diagnostic attempts in coherence, so removing those -// sidestepped the issue for now. - -#![allow(dead_code)] - -pub trait Insertable { - type Values; - - fn values(self) -> Self::Values; -} - -impl<T> Insertable for Option<T> - where - T: Insertable, - T::Values: Default, -{ - type Values = T::Values; - - fn values(self) -> Self::Values { - self.map(Insertable::values).unwrap_or_default() - } -} - -impl<'a, T> Insertable for &'a Option<T> - where - Option<&'a T>: Insertable, -{ - type Values = <Option<&'a T> as Insertable>::Values; - - fn values(self) -> Self::Values { - self.as_ref().values() - } -} - -impl<'a, T> Insertable for &'a [T] -{ - type Values = Self; - - fn values(self) -> Self::Values { - self - } -} - -trait Unimplemented { } - -trait Dummy { } - -struct Foo<T> { t: T } - -impl<'a, U> Dummy for Foo<&'a U> - where &'a U: Insertable -{ -} - -impl<T> Dummy for T - where T: Unimplemented -{ } - -fn main() { -} |