error[E0119]: conflicting implementations of trait `TraitWithAssoc` for type `((&str,),)`
  --> $DIR/unsound-overlap.rs:20:1
   |
LL | impl<T: A> TraitWithAssoc for T {
   | ------------------------------- first implementation here
...
LL | impl TraitWithAssoc for ((&str,),) {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `((&str,),)`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0119`.