error: `cfg` predicate is not specified
  --> $DIR/doc-cfg.rs:3:7
   |
LL | #[doc(cfg(), cfg(foo, bar))]
   |       ^^^^^ help: expected syntax is: `cfg(/* predicate */)`

error: multiple `cfg` predicates are specified
  --> $DIR/doc-cfg.rs:3:23
   |
LL | #[doc(cfg(), cfg(foo, bar))]
   |                       ^^^

error: `cfg` predicate is not specified
  --> $DIR/doc-cfg.rs:7:7
   |
LL | #[doc(cfg())]
   |       ^^^^^ help: expected syntax is: `cfg(/* predicate */)`

error: multiple `cfg` predicates are specified
  --> $DIR/doc-cfg.rs:8:16
   |
LL | #[doc(cfg(foo, bar))]
   |                ^^^

error: aborting due to 4 previous errors