def builtin_lookup(self, mod, name):
        """
        Args
        ----
        mod:
            The __builtins__ dictionary or module, as looked up in
            a module's globals.
        name: str
            The object to lookup
        """
        fromdict = self.pyapi.dict_getitem(mod, self._freeze_string(name))
        self.incref(fromdict)       # fromdict is borrowed
        bbifdict = self.builder.basic_block

        with cgutils.if_unlikely(self.builder, self.is_null(fromdict)):
            # This happen if we are using the __main__ module
            frommod = self.pyapi.object_getattr(mod, self._freeze_string(name))

            with cgutils.if_unlikely(self.builder, self.is_null(frommod)):
                self.pyapi.raise_missing_global_error(name)
                self.return_exception_raised()

            bbifmod = self.builder.basic_block

        builtin = self.builder.phi(self.pyapi.pyobj)
        builtin.add_incoming(fromdict, bbifdict)
        builtin.add_incoming(frommod, bbifmod)

        return builtin

        Args
        ----
        mod:
            The __builtins__ dictionary or module, as looked up in
            a module's globals.
        name: str
            The object to lookup
        
numba/core/pylowering.py