error[E0425]: cannot find value `NUM` in this scope
  --> $DIR/error-default-hygiene.rs:9:23
   |
9  |   pub fn foo(a: i32 = NUM) -> i32
   |                       ^^^ not found in this scope
...
18 |   foo!();
   |   ------- in this macro invocation
help: possible candidate is found in another module, you can import it into scope
   |
3  | use crate::bar::NUM;
   |

For more information about this error, try `rustc --explain E0425`.