Rollup merge of #67595 - ohadravid:impl-trait-does-not-live-long-enough, r=estebank
Suggest adding a lifetime constraint for opaque type Fixes #67577, where code like this: ``` struct List { data: Vec<String>, } impl List { fn started_with<'a>(&'a self, prefix: &'a str) -> impl Iterator<Item=&'a str> { self.data.iter().filter(|s| s.starts_with(prefix)).map(|s| s.as_ref()) } } ``` will show this error: ``` Compiling playground v0.0.1 (/playground) error[E0597]: `prefix` does not live long enough --> src/lib.rs:6:47 | 5 | fn started_with<'a>(&'a self, prefix: &'a str) -> impl Iterator<Item=&'a str> { | -- lifetime `'a` defined here --------------------------- opaque type requires that `prefix` is borrowed for `'a` ... ``` but without suggesting the lovely `help: you can add a constraint..`. r? @estebank
Showing
想要评论请 注册 或 登录