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