Rollup merge of #93463 - dtolnay:_args, r=cjgillot
Rename _args -> args in format_args expansion As observed in https://github.com/rust-lang/rust/pull/91359#discussion_r786058960, prior to that PR this variable was sometimes never used, such as in the case of: ```rust println!(""); // used to expand to: ::std::io::_print( ::core::fmt::Arguments::new_v1( &["\n"], &match () { _args => [], }, ), ); ``` so the leading underscore in `_args` was used to suppress an unused variable lint. However after #91359 the variable is always used when present, as the unused case would instead expand to: ```rust ::std::io::_print(::core::fmt::Arguments::new_v1(&["\n"], &[])); ```
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