Function rustfmt_nightly::comment::left_trim_comment_line

fn left_trim_comment_line<'a>(
    line: &'a str, 
    style: &CommentStyle<'_>
) -> (&'a str, bool)

Trims comment characters and possibly a single space from the left of a string. Does not trim all whitespace. If a single space is trimmed from the left of the string, this function returns true.