<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def rewrite_return_as_assignments(func_node, interface):
 """Modify FunctionDef node to directly assign instead of return."""

    func_node = _RewriteReturn(interface).visit(func_node)
    ast.fix_missing_locations(func_node)
    return func_node