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(m4.info)Invocation

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Macro invocation
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   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.