error: missing `fn` or `struct` for function or struct definition
  --> $DIR/pub-ident-fn-or-struct.rs:1:1
   |
LL | pub S (foo) bar
   | ^^^^^
   |
help: if you meant to call a macro, try
   |
LL | pub S! (foo) bar
   |     ~~

error: aborting due to 1 previous error