rustc is too eager to see macros where there are not

[nox]

https://is.gd/TY8WYH

The actual error is a missing fn.

[estebank]

Current output:

error: missing `fn` for method definition
 --> src/main.rs:1:4
  |
1 | pub what_macro() {}
  |    ^
help: add `fn` here to parse `what_macro` as a public method
  |
1 | pub fn what_macro() {}
  |     ^^

Fixed in #45997.