error[E0562]: `impl Trait` is not allowed in const types
  --> $DIR/issue-58956.rs:7:11
   |
LL | const _A: impl Lam = {
   |           ^^^^^^^^
   |
   = note: `impl Trait` is only allowed in arguments and return types of functions and methods

error[E0562]: `impl Trait` is not allowed in the type of variable bindings
  --> $DIR/issue-58956.rs:9:17
   |
LL |     let x: Wrap<impl Lam> = Wrap(B);
   |                 ^^^^^^^^
   |
   = note: `impl Trait` is only allowed in arguments and return types of functions and methods

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0562`.