warning: not reporting region error due to nll
  --> $DIR/mismatched_trait.rs:16:9
   |
LL |         y //~ ERROR explicit lifetime required
   |         ^

error[E0621]: explicit lifetime required in the type of `y`
  --> $DIR/mismatched_trait.rs:16:9
   |
LL |     fn baz(&self, x: &'a u32, y: &u32) -> &'a u32 {
   |                               - consider changing the type of `y` to `&'a u32`
LL |         y //~ ERROR explicit lifetime required
   |         ^ lifetime `'a` required

error: aborting due to previous error

For more information about this error, try `rustc --explain E0621`.