m4: Syntax
3 Lexical and syntactic conventions
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As 'm4' reads its input, it separates it into "tokens". A token is
either a name, a quoted string, or any single character, that is not a
part of either a name or a string. Input to 'm4' can also contain
comments. GNU 'm4' does not yet understand multibyte locales; all
operations are byte-oriented rather than character-oriented (although if
your locale uses a single byte encoding, such as ISO-8859-1, you will
not notice a difference). However, 'm4' is eight-bit clean, so you can
use non-ASCII characters in quoted strings (⇒Changequote),
comments (⇒Changecom), and macro names (⇒Indir), with the
exception of the NUL character (the zero byte ''\0'').
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