| error: macro requires a cfg-pattern as an argument |
| --> $DIR/cfg.rs:2:5 |
| | |
| LL | cfg!(); |
| | ^^^^^^^ cfg-pattern required |
| | |
| = note: this error originates in the macro `cfg` (in Nightly builds, run with -Z macro-backtrace for more info) |
| |
| error: expected identifier, found `123` |
| --> $DIR/cfg.rs:3:10 |
| | |
| LL | cfg!(123); |
| | ^^^ expected identifier |
| |
| error[E0565]: literal in `cfg` predicate value must be a string |
| --> $DIR/cfg.rs:4:16 |
| | |
| LL | cfg!(foo = 123); |
| | ^^^ |
| |
| error: aborting due to 3 previous errors |
| |
| For more information about this error, try `rustc --explain E0565`. |