| The `not` cfg-predicate was malformed. |
| |
| Erroneous code example: |
| |
| ```compile_fail,E0536 |
| #[cfg(not())] // error: expected 1 cfg-pattern |
| pub fn something() {} |
| |
| pub fn main() {} |
| ``` |
| |
| The `not` predicate expects one cfg-pattern. Example: |
| |
| ``` |
| #[cfg(not(target_os = "linux"))] // ok! |
| pub fn something() {} |
| |
| pub fn main() {} |
| ``` |
| |
| For more information about the `cfg` attribute, read the section on |
| [Conditional Compilation][conditional-compilation] in the Reference. |
| |
| [conditional-compilation]: https://doc.rust-lang.org/reference/conditional-compilation.html |
