error: lifetime may not live long enough --> $DIR/issue-17758.rs:7:9 | LL | trait Foo<'a> { | -- lifetime `'a` defined here LL | fn foo(&'a self); LL | fn bar(&self) { | - let's call the lifetime of this reference `'1` LL | self.foo(); | ^^^^^^^^^^ argument requires that `'1` must outlive `'a` error: aborting due to 1 previous error