error[E0412]: cannot find type `X` in this scope
  --> $DIR/type_not_in_scope.rs:1:6
   |
LL | impl X {
   |      ^ not found in this scope

error[E0573]: expected type, found built-in attribute `cfg_attr`
  --> $DIR/type_not_in_scope.rs:7:18
   |
LL | fn getn<const N: cfg_attr>() -> [u8; N] {}
   |                  ^^^^^^^^ not a type

error[E0308]: mismatched types
  --> $DIR/type_not_in_scope.rs:7:33
   |
LL | fn getn<const N: cfg_attr>() -> [u8; N] {}
   |    ----                         ^^^^^^^ expected array `[u8; N]`, found `()`
   |    |
   |    implicitly returns `()` as its body has no tail or `return` expression

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0308, E0412, E0573.
For more information about an error, try `rustc --explain E0308`.