def get_assignment_source(self, destname):
        """
        Get a possible assignment source (a ir.Var instance) to replace
        *destname*, otherwise None.
        """
        if self.dest_to_src in destname:
            return self.dest_to_src[destname]
        self.unused_dests.discard(destname)
        return None
dataset/ETHPy150Open numba/numba/numba/interpreter.py/Assigner.get_assignment_source/swapped operands of `in`