rust/tests/ui/const-generics/infer/uninferred-consts.rs

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// Test that we emit an error if we cannot properly infer a constant.
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// taken from https://github.com/rust-lang/rust/issues/70507#issuecomment-615268893
struct Foo;
impl Foo {
fn foo<const A: usize, const B: usize>(self) {}
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}
fn main() {
Foo.foo();
//~^ ERROR type annotations needed
}