m4: Other tokens

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1 3.4 Other kinds of input tokens
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1 Any character, that is neither a part of a name, nor of a quoted string,
1 nor a comment, is a token by itself.  When not in the context of macro
1 expansion, all of these tokens are just copied to output.  However,
1 during macro expansion, whitespace characters (space, tab, newline,
1 formfeed, carriage return, vertical tab), parentheses ('(' and ')'),
1 comma (','), and dollar ('$') have additional roles, explained later.
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