error: requires at least a format string argument
  --> $DIR/bad-format-args.rs:12:5
   |
LL |     format!();
   |     ^^^^^^^^^^
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: expected token: `,`
  --> $DIR/bad-format-args.rs:13:5
   |
LL |     format!("" 1);
   |     ^^^^^^^^^^^^^^
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: expected token: `,`
  --> $DIR/bad-format-args.rs:14:5
   |
LL |     format!("", 1 1);
   |     ^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to 3 previous errors