error[E0060]: this function takes at least 1 argument but 0 arguments were supplied
  --> $DIR/E0060.rs:6:14
   |
LL |     fn printf(_: *const u8, ...) -> u32;
   |     ------------------------------------ defined here
...
LL |     unsafe { printf(); }
   |              ^^^^^^-- supplied 0 arguments
   |              |
   |              expected at least 1 argument

error: aborting due to previous error

For more information about this error, try `rustc --explain E0060`.