error: `crate` references the macro call's crate
  --> $DIR/crate_in_macro_def.rs:19:28
   |
LL |             println!("{}", crate::unhygienic::MESSAGE);
   |                            ^^^^^ help: to reference the macro definition's crate, use: `$crate`
   |
   = note: `-D clippy::crate-in-macro-def` implied by `-D warnings`

error: aborting due to previous error