error[E0091]: type parameter `T` is never used
  --> $DIR/E0091.rs:1:10
   |
LL | type Foo<T> = u32;
   |          ^ unused type parameter
   |
   = help: consider removing `T` or referring to it in the body of the type alias
   = help: if you intended `T` to be a const parameter, use `const T: /* Type */` instead

error[E0091]: type parameter `B` is never used
  --> $DIR/E0091.rs:2:14
   |
LL | type Foo2<A, B> = Box<A>;
   |              ^ unused type parameter
   |
   = help: consider removing `B` or referring to it in the body of the type alias
   = help: if you intended `B` to be a const parameter, use `const B: /* Type */` instead

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0091`.