mirror of https://github.com/rust-lang/rust
23 lines
495 B
Rust
23 lines
495 B
Rust
// Regression test for issue #121898.
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trait Base {
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type Base<B>;
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}
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trait Functor<A>: Base {
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fn fmap<B>(self, f: impl Fn(A) -> B) -> Self::Base<B>
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where
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Self::Base<B>: Functor<B>;
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}
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fn fmap2<T, A, B, C>(input: T, f1: impl Fn(A) -> B, f2: impl Fn(B) -> C) -> T::Base<C>
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where
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T: Functor<A>,
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T::Base<B>: Functor<B, Base<C> = T::Base<C>>,
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{
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input.fmap(f1).fmap(f2)
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//~^ ERROR the trait bound `<T as Base>::Base<C>: Functor<C>` is not satisfied
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}
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fn main() {}
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