error: expected lifetime, type, or constant, found keyword `const`
  --> $DIR/issue-89013-no-assoc.rs:9:10
   |
LL | impl Foo<const 3> for Bar {
   |          ^^^^^
   |
help: the `const` keyword is only needed in the definition of the type
   |
LL - impl Foo<const 3> for Bar {
LL + impl Foo<3> for Bar {
   |

error: aborting due to previous error