mirror of https://github.com/rust-lang/rust
40 lines
738 B
Rust
40 lines
738 B
Rust
// Check that we handle evaluating `wf` predicates correctly.
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//@ check-pass
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struct X<T: B>(T)
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where
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T::V: Clone;
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fn hide<T>(t: T) -> impl Sized {
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t
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}
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trait A {
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type U;
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}
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impl<T> A for T {
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type U = T;
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}
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trait B {
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type V;
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}
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impl<S: A<U = T>, T> B for S {
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type V = T;
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}
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fn main() {
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// Evaluating `typeof(x): Sized` requires
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//
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// - `wf(typeof(x))` because we use a projection candidate.
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// - `<i32 as B>::V: Clone` because that's a bound on the trait.
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// - `<i32 as B>::V` normalizes to `?1t` where `<i32 as A>::U == ?1t`
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//
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// This all works if we evaluate `<i32 as A>::U == ?1t` before
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// `<i32 as B>::V`, but we previously had the opposite order.
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let x = hide(X(0));
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}
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