error[E0049]: const `A` has 1 type parameter but its trait declaration has 0 type parameters
  --> $DIR/compare-impl-item.rs:16:13
   |
LL |     const A: ();
   |            - expected 0 type parameters
...
LL |     const A<T>: () = ();
   |             ^ found 1 type parameter

error[E0049]: const `B` has 1 const parameter but its trait declaration has 2 const parameters
  --> $DIR/compare-impl-item.rs:18:13
   |
LL |     const B<const K: u64, const Q: u64>: u64;
   |             ------------  ------------
   |             |
   |             expected 2 const parameters
...
LL |     const B<const K: u64>: u64 = 0;
   |             ^^^^^^^^^^^^ found 1 const parameter

error[E0049]: const `C` has 0 type parameters but its trait declaration has 1 type parameter
  --> $DIR/compare-impl-item.rs:20:13
   |
LL |     const C<T>: T;
   |             - expected 1 type parameter
...
LL |     const C<'a>: &'a str = "";
   |             ^^ found 0 type parameters

error[E0053]: const `D` has an incompatible generic parameter for trait `Trait`
  --> $DIR/compare-impl-item.rs:22:13
   |
LL | trait Trait<P> {
   |       -----
...
LL |     const D<const N: usize>: usize;
   |             -------------- expected const parameter of type `usize`
...
LL | impl<P> Trait<P> for () {
   | -----------------------
...
LL |     const D<const N: u16>: u16 = N;
   |             ^^^^^^^^^^^^ found const parameter of type `u16`

error[E0195]: lifetime parameters or bounds on const `E` do not match the trait declaration
  --> $DIR/compare-impl-item.rs:24:12
   |
LL |     const E<'a>: &'a ();
   |            ---- lifetimes in impl do not match this const in trait
...
LL |     const E: &'static () = &();
   |            ^ lifetimes do not match const in trait

error[E0276]: impl has stricter requirements than trait
  --> $DIR/compare-impl-item.rs:29:12
   |
LL |     const F: usize;
   |     -------------- definition of `F` from trait
...
LL |         P: Copy;
   |            ^^^^ impl has extra requirement `P: Copy`

error[E0276]: impl has stricter requirements than trait
  --> $DIR/compare-impl-item.rs:30:16
   |
LL |     const G<T: PartialEq>: ();
   |     ------------------------- definition of `G` from trait
...
LL |     const G<T: Eq>: () = ();
   |                ^^ impl has extra requirement `T: Eq`

error: aborting due to 7 previous errors

Some errors have detailed explanations: E0049, E0053, E0195, E0276.
For more information about an error, try `rustc --explain E0049`.