I ran into this trying things in the playground. It returns a non sensical suggested fix. Did a quick search and didn't find anything. Is this known bug or should I file an issue?
Compiling playground v0.0.1 (/playground) error[E0106]: missing lifetime specifier --> src/lib.rs:12:21 | 12 | type Item = Foo<R>; | ^ expected named lifetime parameter | help: consider introducing a named lifetime parameter | 12 | type Item<'a> = Foo<<'a>R>; | ^^^^ ^^^^