| // This uses edition 2024 for new lifetime capture rules. |
| //@ edition: 2024 |
| |
| // The problem here is that the presence of the opaque which captures all lifetimes in scope |
| // means that the duplicated `'a` (which I'll call the dupe) is considered to be *early-bound* |
| // since it shows up in the output but not the inputs. This is paired with the fact that we |
| // were previously setting the name of the dupe to `'_` in the generic param definition, which |
| // means that the identity args for the function were `['a#0, '_#1]` even though the lifetime |
| // for the dupe should've been `'a#1`. This difference in symbol meant that NLL couldn't |
| // actually match the lifetime against the identity lifetimes, leading to an ICE. |
| |
| struct Foo<'a>(&'a ()); |
| |
| impl<'a> Foo<'a> { |
| fn pass<'a>() -> impl Sized {} |
| //~^ ERROR lifetime name `'a` shadows a lifetime name that is already in scope |
| } |
| |
| fn main() {} |
