1 The `not` cfg-predicate was malformed.
3 Erroneous code example:
6 #[cfg(not())] // error: expected 1 cfg-pattern
12 The `not` predicate expects one cfg-pattern. Example:
15 #[cfg(not(target_os = "linux"))] // ok!
21 For more information about the cfg attribute, read:
22 https://doc.rust-lang.org/reference.html#conditional-compilation