error[E0495]: cannot infer an appropriate lifetime for autoref due to conflicting requirements
  --> $DIR/issue-16683.rs:4:14
   |
LL |         self.a();
   |              ^
   |
note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the method body at 3:5...
  --> $DIR/issue-16683.rs:3:5
   |
LL | /     fn b(&self) {
LL | |         self.a();
LL | |     }
   | |_____^
note: ...so that reference does not outlive borrowed content
  --> $DIR/issue-16683.rs:4:9
   |
LL |         self.a();
   |         ^^^^
note: but, the lifetime must be valid for the lifetime 'a as defined on the trait at 1:9...
  --> $DIR/issue-16683.rs:1:9
   |
LL | trait T<'a> {
   |         ^^
   = note: ...so that the types are compatible:
           expected &'a Self
              found &Self

error: aborting due to previous error