case BoundKind.AssignmentOperator:
                    // PROTOTYPE(RefStructInterfaces): We do not have a test that demonstrates that the statement below makes a difference.
                    //                                 If 'scopeOfTheContainingExpression' is always returned, not a single test fails.
                    //                                 Same for the 'case BoundKind.NullCoalescingAssignmentOperator:' below.
                    return GetValEscape(((BoundAssignmentOperator)expr).Right, scopeOfTheContainingExpression);