58 lines
1.1 KiB
Rust
58 lines
1.1 KiB
Rust
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// check-fail
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//
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// regression test for issue 52893
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trait At<Name> {
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type AtRes;
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fn at(self) -> Self::AtRes;
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}
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trait Push<T> {
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type PushRes;
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fn push(self, other: T) -> Self::PushRes;
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}
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trait AddClass<Name, F> {
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type AddRes;
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fn init(self, func: F);
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}
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trait ToRef {
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type RefRes;
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fn to_ref(&self) -> Self::RefRes;
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}
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struct Class<P>(P);
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impl<P> Class<P> {
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fn with<Name, F>(self) -> <Self as AddClass<Name, F>>::AddRes
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where
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Self: AddClass<Name, F>,
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{
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todo!()
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}
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fn from<F>(self) -> <Self as AddClass<P, F>>::AddRes
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where
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Self: AddClass<P, F>,
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{
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todo!()
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}
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}
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impl<F, Name, P> AddClass<Name, F> for Class<P>
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where
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Self: At<Name>,
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<Self as At<Name>>::AtRes: Push<F>,
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<<Self as At<Name>>::AtRes as Push<F>>::PushRes: ToRef<RefRes = Self> + Push<F>,
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{
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type AddRes = ();
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fn init(self, func: F) {
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let builder = self.at().push(func);
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let output = builder.to_ref();
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builder.push(output); //~ ERROR mismatched types [E0308]
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}
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}
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fn main() {}
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