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User defined macros may be invoked explicitly or implicitly.
If you invoke one implicitly, the macro must begin with the
name of the defined macro. Consequently, this may not
be a computed value. If you explicitly invoke a user defined macro,
the macro begins with the macro name INVOKE followed by
a basic expression that must yield a known user defined macro.
A macro name _must_ be found, or AutoGen will issue a diagnostic
and exit.
Arguments are passed to the invoked macro by name.
The text following the macro name must consist of a series of
names each of which is followed by an equal sign (=) and
a basic expression that yields a string.
The string values may contain template macros that are parsed the first time the macro is processed and evaluated again every time the macro is evaluated.