Miss Dada  🏳️‍⚧️

Let me see if I can whip one up really quick

Honestly thought I'd be able to pare it down more than this. The intermediate iter struct is important to get it to give the bad suggestion. Couldn't reduce down to returning `self.0.iter()` directly. https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=62414e75e13830af0ae63570662e0385 …

With the unrelated compiler error removed https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=2b665a6403bd4fa87ea51da5230550d8 …

I see what happens... The suggestion is currently naive and only works well if there's only one inferred 'static, but here there are two and I wrote no code to account for them.

Great repro case, I'll see if I can do something about it.

Yeah luckily this was easy to spot at the time because the code (written before impl trait and '_) was previously returning `Box<dyn Iterator<Box<dyn Stage + 'a>> + 'a>`. I was just curious if I could omit any/both of those lifetimes now.

Ironically you *can* omit the one the compiler suggests