mirror of https://github.com/rust-lang/rust
31 lines
775 B
Rust
31 lines
775 B
Rust
//@ build-fail
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//@ compile-flags: -Zunleash-the-miri-inside-of-you
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// a test demonstrating why we do need to run static const qualification on associated constants
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// instead of just checking the final constant
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trait Foo<T> {
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const X: T;
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}
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trait Bar<T, U: Foo<T>> {
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const F: u32 = (U::X, 42).1;
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}
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impl Foo<u32> for () {
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const X: u32 = 42;
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}
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impl Foo<Vec<u32>> for String {
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const X: Vec<u32> = Vec::new();
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}
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impl Bar<u32, ()> for () {}
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impl Bar<Vec<u32>, String> for String {}
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fn main() {
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// this is fine, but would have been forbidden by the static checks on `F`
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let x = <() as Bar<u32, ()>>::F;
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// this test only causes errors due to the line below, so post-monomorphization
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let y = <String as Bar<Vec<u32>, String>>::F; //~ constant
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}
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