// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/*@testedFeatures=inference*/
library test;

int getInt() => 0;
num getNum() => 0;
double getDouble() => 0.0;

abstract class Test<T, U> {
  T operator [](String s);
  void operator []=(String s, U v);
}

void test1(Test<int, int> t) {
  var /*@ type=int* */ v1 = t /*@target=Test::[]=*/ ['x'] = getInt();

  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=int* */ v4 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getInt();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=int* */ v7 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getInt();

  var /*@ type=num* */ v8 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getNum();

  var /*@ type=int* */ v10 =
      /*@ target=num::+ */ ++t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=int* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=num::+ */ ++;
}

void test2(Test<int, num> t) {
  var /*@ type=int* */ v1 = t /*@target=Test::[]=*/ ['x'] = getInt();

  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=double* */ v3 = t /*@target=Test::[]=*/ ['x'] = getDouble();

  var /*@ type=int* */ v4 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getInt();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=num* */ v6 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getDouble();

  var /*@ type=int* */ v7 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getInt();

  var /*@ type=num* */ v8 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getNum();

  var /*@ type=double* */ v9 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getDouble();

  var /*@ type=int* */ v10 =
      /*@ target=num::+ */ ++t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=int* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=num::+ */ ++;
}

void test3(Test<int, double> t) {
  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=double* */ v3 = t /*@target=Test::[]=*/ ['x'] = getDouble();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=num* */ v6 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getDouble();

  var /*@ type=int* */ v7 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getInt();

  var /*@ type=num* */ v8 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getNum();

  var /*@ type=double* */ v9 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getDouble();

  var /*@ type=int* */ v10 =
      /*@ target=num::+ */ ++t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=int* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=num::+ */ ++;
}

void test4(Test<num, int> t) {
  var /*@ type=int* */ v1 = t /*@target=Test::[]=*/ ['x'] = getInt();

  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=num* */ v4 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getInt();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=num* */ v7 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getInt();

  var /*@ type=num* */ v8 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getNum();

  var /*@ type=num* */ v10 =
      /*@ target=num::+ */ ++t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=num* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=num::+ */ ++;
}

void test5(Test<num, num> t) {
  var /*@ type=int* */ v1 = t /*@target=Test::[]=*/ ['x'] = getInt();

  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=double* */ v3 = t /*@target=Test::[]=*/ ['x'] = getDouble();

  var /*@ type=num* */ v4 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getInt();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=num* */ v6 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getDouble();

  var /*@ type=num* */ v7 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getInt();

  var /*@ type=num* */ v8 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getNum();

  var /*@ type=num* */ v9 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getDouble();

  var /*@ type=num* */ v10 =
      /*@ target=num::+ */ ++t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=num* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=num::+ */ ++;
}

void test6(Test<num, double> t) {
  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=double* */ v3 = t /*@target=Test::[]=*/ ['x'] = getDouble();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=num* */ v6 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getDouble();

  var /*@ type=num* */ v7 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getInt();

  var /*@ type=num* */ v8 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getNum();

  var /*@ type=num* */ v9 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'] /*@ target=num::+ */ +=
          getDouble();

  var /*@ type=num* */ v10 =
      /*@ target=num::+ */ ++t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=num* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=num::+ */ ++;
}

void test7(Test<double, int> t) {
  var /*@ type=int* */ v1 = t /*@target=Test::[]=*/ ['x'] = getInt();

  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=num* */ v4 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getInt();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=double* */ v7 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getInt();

  var /*@ type=double* */ v8 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getNum();

  var /*@ type=double* */ v10 =
      /*@ target=double::+ */ ++t
          /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=double* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ ++;
}

void test8(Test<double, num> t) {
  var /*@ type=int* */ v1 = t /*@target=Test::[]=*/ ['x'] = getInt();

  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=double* */ v3 = t /*@target=Test::[]=*/ ['x'] = getDouble();

  var /*@ type=num* */ v4 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getInt();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=double* */ v6 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
          /*@target=num::==*/ ??= getDouble();

  var /*@ type=double* */ v7 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getInt();

  var /*@ type=double* */ v8 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getNum();

  var /*@ type=double* */ v9 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getDouble();

  var /*@ type=double* */ v10 =
      /*@ target=double::+ */ ++t
          /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=double* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ ++;
}

void test9(Test<double, double> t) {
  var /*@ type=num* */ v2 = t /*@target=Test::[]=*/ ['x'] = getNum();

  var /*@ type=double* */ v3 = t /*@target=Test::[]=*/ ['x'] = getDouble();

  var /*@ type=num* */ v5 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
      /*@target=num::==*/ ??= getNum();

  var /*@ type=double* */ v6 =
      t /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x']
          /*@target=num::==*/ ??= getDouble();

  var /*@ type=double* */ v7 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getInt();

  var /*@ type=double* */ v8 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getNum();

  var /*@ type=double* */ v9 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ += getDouble();

  var /*@ type=double* */ v10 =
      /*@ target=double::+ */ ++t
          /*@target=Test::[]*/ /*@target=Test::[]=*/ ['x'];

  var /*@ type=double* */ v11 = t /*@target=Test::[]*/ /*@target=Test::[]=*/ [
      'x'] /*@ target=double::+ */ ++;
}

main() {}