38 lines
687 B
Rust
38 lines
687 B
Rust
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// Regression test for #77653
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// When monomorphizing `f` we need to prove `dyn Derived<()>: Base<()>`. This
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// requires us to normalize the `Base<<() as Proj>::S>` to `Base<()>` when
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// comparing the supertrait `Derived<()>` to the expected trait.
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// build-pass
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trait Proj {
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type S;
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}
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impl Proj for () {
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type S = ();
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}
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impl Proj for i32 {
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type S = i32;
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}
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trait Base<T> {
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fn is_base(&self);
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}
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trait Derived<B: Proj>: Base<B::S> + Base<()> {
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fn is_derived(&self);
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}
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fn f<P: Proj>(obj: &dyn Derived<P>) {
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obj.is_derived();
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Base::<P::S>::is_base(obj);
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Base::<()>::is_base(obj);
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}
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fn main() {
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let x: fn(_) = f::<()>;
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let x: fn(_) = f::<i32>;
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}
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