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(m4.info.gz) Names

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 2.1 Macro names
 ===============
 
 A name is any sequence of letters, digits, and the character `_'
 (underscore), where the first character is not a digit.  `m4' will use
 the longest such sequence found in the input.  If a name has a macro
 definition, it will be subject to macro expansion ( Macros).
 Names are case-sensitive.
 
    Examples of legal names are: `foo', `_tmp', and `name01'.
 
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