error: expected lifetime, type, or constant, found keyword `const`
  --> $DIR/issue-89013.rs:9:14
   |
LL | impl Foo<N = const 3> for Bar {
   |              ^^^^^
   |
help: the `const` keyword is only needed in the definition of the type
   |
LL - impl Foo<N = const 3> for Bar {
LL + impl Foo<N = 3> for Bar {
   | 

error: cannot constrain an associated constant to a value
  --> $DIR/issue-89013.rs:9:10
   |
LL | impl Foo<N = const 3> for Bar {
   |          -^^^^^^^^^-
   |          |         |
   |          |         ...cannot be constrained to this value
   |          this associated constant...

error[E0229]: associated type bindings are not allowed here
  --> $DIR/issue-89013.rs:9:10
   |
LL | impl Foo<N = const 3> for Bar {
   |          ^^^^^^^^^^^ associated type not allowed here

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0229`.