error: expected identifier, found keyword `Self`
  --> $DIR/issue-36638.rs:1:12
   |
LL | struct Foo<Self>(Self);
   |            ^^^^ expected identifier, found keyword

error: expected identifier, found keyword `Self`
  --> $DIR/issue-36638.rs:5:11
   |
LL | trait Bar<Self> {}
   |           ^^^^ expected identifier, found keyword

error[E0392]: parameter `Self` is never used
  --> $DIR/issue-36638.rs:1:12
   |
LL | struct Foo<Self>(Self);
   |            ^^^^ unused parameter
   |
   = help: consider removing `Self`, referring to it in a field, or using a marker such as `PhantomData`

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0392`.