def dummy(cls, op, info, loc):
        """
        A node for a dummy value.

        This node is a place holder for carrying information through to a point
        where it is rewritten into something valid. This node is not handled
        by type inference or lowering. It's presence outside of the interpreter
        renders IR as illegal.
        """
        assert isinstance(loc, Loc)
        assert isinstance(op, str)
        return cls(op=op, info=info, loc=loc)

        A node for a dummy value.

        This node is a place holder for carrying information through to a point
        where it is rewritten into something valid. This node is not handled
        by type inference or lowering. It's presence outside of the interpreter
        renders IR as illegal.
        
numba/core/ir.py