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SYNOPSIS
int referencep(mixed arg)
DESCRIPTION
returns true if arg was passed by reference to the current
function, instead of the usual call-by-value.
Note that arg has to be passed by reference to the efun,
a.g. referencep(&x).
SEE ALSO
references(LPC), bytesp(E), clonep(E), closurep(E), coroutinep(E),
floatp(E), intp(E), lpctypep(E), lwobjectp(E), mappingp(E),
objectp(E), pointerp(E), stringp(E), structp(E), symbolp(E)