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Keep space if arg does not follow punctuation when lint unused parens Fixes rust-lang/rust#138234 If the arg follows punctuation, still pass `left_pos` with `None` and no space will be added, else then pass `left_pos` with `Some(arg.span.lo())`, so that we can add the space as expected. And `emit_unused_delims` can make sure no more space will be added if the expr follows space. --- Edited: Directly use the `value_span` to check whether the expr removed parens will follow identifier or be followed by identifier.