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Auto merge of #73596 - petrochenkov:shebang2, r=Mark-Simulacrum
rustc_lexer: Simplify shebang parsing once more Fixes #73250 (beta regression) Treat any line starting with `!#` as a shebang candidate, not only lines with something non-whitespace. This way we no longer need to define what `is_whitespace` means ([Linux shebang whitespace](https://github.com/torvalds/linux/blob/master/fs/binfmt_script.c), ASCII whitespace, Rust lexer whitespace, etc), which is nice. This change makes some invalid Rust code valid (see the regression above), but still never interprets a fragment of valid Rust code as a shebang. (This PR also removes one duplicate test.)
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