error: lifetime may not live long enough --> $DIR/issue-16683.rs:4:9 | LL | trait T<'a> { | -- lifetime `'a` defined here LL | fn a(&'a self) -> &'a bool; LL | fn b(&self) { | - let's call the lifetime of this reference `'1` LL | self.a(); | ^^^^^^^^ argument requires that `'1` must outlive `'a` error: aborting due to 1 previous error