error[E0310]: the parameter type `T` may not live long enough
  --> $DIR/builtin-superkinds-self-type.rs:20:16
   |
LL | impl <T: Sync> Foo for T { }
   |       --       ^^^
   |       |
   |       help: consider adding an explicit lifetime bound `T: 'static`...
   |
note: ...so that the type `T` will meet its required lifetime bounds
  --> $DIR/builtin-superkinds-self-type.rs:20:16
   |
LL | impl <T: Sync> Foo for T { }
   |                ^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0310`.