src/test/ui/issues/issue-47511.stderr

   1 error[E0581]: return type references an anonymous lifetime, which is not constrained by the fn input types
   2   --> $DIR/issue-47511.rs:8:15
   3    |
   4 LL | fn f(_: X) -> X {
   5    |               ^
   6    |
   7    = note: lifetimes appearing in an associated or opaque type are not considered constrained
   8    = note: consider introducing a named lifetime parameter
   9
  10 error[E0581]: return type references lifetime `'a`, which is not constrained by the fn input types
  11   --> $DIR/issue-47511.rs:12:23
  12    |
  13 LL | fn g<'a>(_: X<'a>) -> X<'a> {
  14    |                       ^^^^^
  15
  16 error: aborting due to 2 previous errors
  17
  18 For more information about this error, try `rustc --explain E0581`.