src/test/ui/const-generics/defaults/default-on-impl.full.stderr

   1 error: defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions
   2   --> $DIR/default-on-impl.rs:8:12
   3    |
   4 LL | impl<const N: usize = 1> Foo<N> {}
   5    |            ^
   6
   7 error: aborting due to previous error
   8