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4.1 Macro invocation
Macro invocations has one of the forms
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
is a macro call with one argument, which is the empty string, not a call
with no arguments.
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