Function exists

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SYNOPSIS:

       string function_exists(string str, object ob)

DESCRIPTION:

       Return the file name of the object that defines the function
       str in object ob. The returned value can be other than
       file_name(ob) if the function is defined in an inherited
       object. The returned name always begins with a '/' (absolute
       path). 0 is returned if the function was not defined.

SEE ALSO:

       call_other(E)