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error: macro requires a cfg-pattern as an argument
--> $DIR/cfg.rs:2:5
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LL | cfg!();
| ^^^^^^ cfg-pattern required
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= 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
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LL | cfg!(123);
| ^^^ expected identifier
error[E0565]: literal in `cfg` predicate value must be a string
--> $DIR/cfg.rs:4:16
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LL | cfg!(foo = 123);
| ^^^
error: expected 1 cfg-pattern
--> $DIR/cfg.rs:5:5
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LL | cfg!(foo, bar);
| ^^^^^^^^^^^^^^
|
= note: this error originates in the macro `cfg` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 4 previous errors
For more information about this error, try `rustc --explain E0565`.
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