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 3.1 Macro invocation
 ====================
 
 Macro invocations has one of the forms
 
      name
 
 which is a macro invocation without any arguments, or
 
      name(arg1, arg2, ..., argN)
 
 which is a macro invocation with N arguments.  Macros can have any
 number of arguments.  All arguments are strings, but different macros
 might interpret the arguments in different ways.
 
    The opening parenthesis _must_ follow the NAME directly, with no
 spaces in between.  If it does not, the macro is called with no
 arguments at all.
 
    For a macro call to have no arguments, the parentheses _must_ be
 left out.  The macro call
 
      name()
 
 is a macro call with one argument, which is the empty string, not a call
 with no arguments.
 

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