error[E0275]: overflow evaluating the requirement `<(T,) as Grault>::A == _`
  --> $DIR/impl-wf-cycle-1.rs:15:1
   |
LL | impl<T: Grault> Grault for (T,)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: required because of the requirements on the impl of `Grault` for `(T,)`
  --> $DIR/impl-wf-cycle-1.rs:15:17
   |
LL | impl<T: Grault> Grault for (T,)
   |                 ^^^^^^     ^^^^
   = note: 1 redundant requirement hidden
   = note: required because of the requirements on the impl of `Grault` for `(T,)`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0275`.