error: trait aliases cannot be `auto`
  --> $DIR/trait-alias-syntax.rs:4:19
   |
LL | auto trait A = Foo;
   |                   ^ trait aliases cannot be `auto`

error: trait aliases cannot be `unsafe`
  --> $DIR/trait-alias-syntax.rs:5:21
   |
LL | unsafe trait B = Foo;
   |                     ^ trait aliases cannot be `unsafe`

error: aborting due to 2 previous errors