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(m4.info)Builtin

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Indirect call of builtins
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   Builtin macros can be called indirectly with `builtin':

     builtin(NAME, ...)

which results in a call to the builtin NAME, which is passed the rest
of the arguments.  This can be used, if NAME has been given another
definition that has covered the original.

   The macro `builtin' is recognized only with parameters.