error[E0521]: borrowed data escapes outside of closure --> $DIR/anonymous-region-in-apit.rs:8:17 | LL | fn qux(foo: impl Foo<&str>) { | --- lifetime `'2` appears in the type of `foo` LL | |baz: &str| foo.bar(baz); | --- - ^^^^^^^^^^^^ | | | | | | | `baz` escapes the closure body here | | | argument requires that `'1` must outlive `'2` | | let's call the lifetime of this reference `'1` | `baz` is a reference that is only valid in the closure body error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0521`.