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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/associated-types/issue-67684.rs | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/issue-67684.rs b/src/test/ui/associated-types/issue-67684.rs new file mode 100644 index 000000000..49efe8a1b --- /dev/null +++ b/src/test/ui/associated-types/issue-67684.rs @@ -0,0 +1,62 @@ +// check-pass + +#![allow(dead_code)] + +trait ParseError { + type StreamError; +} + +impl<T> ParseError for T { + type StreamError = (); +} + +trait Stream { + type Item; + type Error: ParseError; +} + +trait Parser +where + <Self as Parser>::PartialState: Default, +{ + type PartialState; + fn parse_mode(_: &Self, _: Self::PartialState) { + loop {} + } +} + +impl Stream for () { + type Item = (); + type Error = (); +} + +impl Parser for () { + type PartialState = (); +} + +struct AndThen<A, B>(core::marker::PhantomData<(A, B)>); + +impl<A, B> Parser for AndThen<A, B> +where + A: Stream, + B: Into<<A::Error as ParseError>::StreamError>, +{ + type PartialState = (); +} + +fn expr<A>() -> impl Parser +where + A: Stream<Error = <A as Stream>::Item>, +{ + AndThen::<A, ()>(core::marker::PhantomData) +} + +fn parse_mode_impl<A>() +where + <A as Stream>::Error: ParseError, + A: Stream<Error = <A as Stream>::Item>, +{ + Parser::parse_mode(&expr::<A>(), Default::default()) +} + +fn main() {} |