error: `Self` is not valid in the self type of an impl block
  --> $DIR/resolve-self-in-impl.rs:14:13
   |
LL | impl Tr for Self {}
   |             ^^^^
   |
   = note: replace `Self` with a different type

error: `Self` is not valid in the self type of an impl block
  --> $DIR/resolve-self-in-impl.rs:15:15
   |
LL | impl Tr for S<Self> {}
   |               ^^^^
   |
   = note: replace `Self` with a different type

error: `Self` is not valid in the self type of an impl block
  --> $DIR/resolve-self-in-impl.rs:16:6
   |
LL | impl Self {}
   |      ^^^^
   |
   = note: replace `Self` with a different type

error: `Self` is not valid in the self type of an impl block
  --> $DIR/resolve-self-in-impl.rs:17:8
   |
LL | impl S<Self> {}
   |        ^^^^
   |
   = note: replace `Self` with a different type

error: `Self` is not valid in the self type of an impl block
  --> $DIR/resolve-self-in-impl.rs:18:7
   |
LL | impl (Self, Self) {}
   |       ^^^^  ^^^^
   |
   = note: replace `Self` with a different type

error[E0391]: cycle detected when computing trait implemented by `<impl at $DIR/resolve-self-in-impl.rs:19:1: 19:23>`
  --> $DIR/resolve-self-in-impl.rs:19:1
   |
LL | impl Tr<Self::A> for S {}
   | ^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: ...which immediately requires computing trait implemented by `<impl at $DIR/resolve-self-in-impl.rs:19:1: 19:23>` again
note: cycle used when collecting item types in top-level module
  --> $DIR/resolve-self-in-impl.rs:1:1
   |
LL | / #![feature(associated_type_defaults)]
LL | |
LL | | struct S<T = u8>(T);
LL | | trait Tr<T = u8> {
...  |
LL | |
LL | | fn main() {}
   | |____________^
   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0391`.