error[E0284]: type annotations needed
  --> $DIR/dyn-compatibility-ok-infer-err.rs:19:5
   |
LL |     use_dyn(&());
   |     ^^^^^^^ cannot infer the value of the const parameter `N` declared on the function `use_dyn`
   |
note: required by a const generic parameter in `use_dyn`
  --> $DIR/dyn-compatibility-ok-infer-err.rs:14:12
   |
LL | fn use_dyn<const N: usize>(v: &dyn Foo<N>) where [u8; N + 1]: Sized {
   |            ^^^^^^^^^^^^^^ required by this const generic parameter in `use_dyn`
help: consider specifying the generic argument
   |
LL |     use_dyn::<N>(&());
   |            +++++

error[E0284]: type annotations needed
  --> $DIR/dyn-compatibility-ok-infer-err.rs:19:5
   |
LL |     use_dyn(&());
   |     ^^^^^^^ --- type must be known at this point
   |     |
   |     cannot infer the value of the const parameter `N` declared on the function `use_dyn`
   |
note: required for `()` to implement `Foo<_>`
  --> $DIR/dyn-compatibility-ok-infer-err.rs:8:22
   |
LL | impl<const N: usize> Foo<N> for () {
   |      --------------  ^^^^^^     ^^
   |      |
   |      unsatisfied trait bound introduced here
   = note: required for the cast from `&()` to `&dyn Foo<_>`
help: consider specifying the generic argument
   |
LL |     use_dyn::<N>(&());
   |            +++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0284`.