def _lower_var_to_var_assign(lowerer, inst):
    """Lower Var->Var assignment.

    Returns True if-and-only-if `inst` is a Var->Var assignment.
    """
    if isinstance(inst, ir.Assign) and isinstance(inst.value, ir.Var):
        loaded = lowerer.loadvar(inst.value.name)
        lowerer.storevar(loaded, name=inst.target.name)
        return True
    return False
Lower Var->Var assignment.

    Returns True if-and-only-if `inst` is a Var->Var assignment.
    
numba/parfors/parfor_lowering.py