error[E0119]: conflicting implementations of trait `IntoCow<'_, _>` for type `Cow<'_, _>`
  --> $DIR/associated-types-coherence-failure.rs:21:1
   |
LL | impl<'a, B: ?Sized> IntoCow<'a, B> for <B as ToOwned>::Owned where B: ToOwned {
   | ------------------------------------------------------------ first implementation here
...
LL | impl<'a, B: ?Sized> IntoCow<'a, B> for Cow<'a, B> where B: ToOwned {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Cow<'_, _>`

error[E0119]: conflicting implementations of trait `IntoCow<'_, _>` for type `&_`
  --> $DIR/associated-types-coherence-failure.rs:28:1
   |
LL | impl<'a, B: ?Sized> IntoCow<'a, B> for <B as ToOwned>::Owned where B: ToOwned {
   | ------------------------------------------------------------ first implementation here
...
LL | impl<'a, B: ?Sized> IntoCow<'a, B> for &'a B where B: ToOwned {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `&_`

error: aborting due to 2 previous errors

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