1 error: requires at least a format string argument
2 --> $DIR/ifmt-bad-format-args.rs:2:5
7 = note: this error originates in the macro `format_args` (in Nightly builds, run with -Z macro-backtrace for more info)
9 error: format argument must be a string literal
10 --> $DIR/ifmt-bad-format-args.rs:3:18
12 LL | format_args!(|| {});
15 help: you might be missing a string literal to format with
17 LL | format_args!("{}", || {});
20 error: aborting due to 2 previous errors