diff options
Diffstat (limited to 'src/test/ui/consts/miri_unleashed/assoc_const.rs')
-rw-r--r-- | src/test/ui/consts/miri_unleashed/assoc_const.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/consts/miri_unleashed/assoc_const.rs b/src/test/ui/consts/miri_unleashed/assoc_const.rs new file mode 100644 index 000000000..5f520c2cf --- /dev/null +++ b/src/test/ui/consts/miri_unleashed/assoc_const.rs @@ -0,0 +1,32 @@ +// build-fail +// compile-flags: -Zunleash-the-miri-inside-of-you + +#![allow(const_err)] + +// a test demonstrating why we do need to run static const qualification on associated constants +// instead of just checking the final constant + +trait Foo<T> { + const X: T; +} + +trait Bar<T, U: Foo<T>> { + const F: u32 = (U::X, 42).1; +} + +impl Foo<u32> for () { + const X: u32 = 42; +} +impl Foo<Vec<u32>> for String { + const X: Vec<u32> = Vec::new(); +} + +impl Bar<u32, ()> for () {} +impl Bar<Vec<u32>, String> for String {} + +fn main() { + // this is fine, but would have been forbidden by the static checks on `F` + let x = <() as Bar<u32, ()>>::F; + // this test only causes errors due to the line below, so post-monomorphization + let y = <String as Bar<Vec<u32>, String>>::F; //~ ERROR erroneous constant +} |