| error[E0805]: malformed `cfg` macro input | |
| --> $DIR/E0805.rs:2:8 | |
| | | |
| LL | if cfg!(not()) { } | |
| | ^^^^^^^^--^ | |
| | | | | |
| | | expected a single argument here | |
| | help: must be of the form: `cfg!(predicate)` | |
| | | |
| = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute> | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0805`. |