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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 // Verify that the static type of a ??= b is the least upper bound of the | 5 // Verify that the static type of a ??= b is the least upper bound of the |
6 // static types of a and b. | 6 // static types of a and b. |
7 | 7 |
8 import "package:expect/expect.dart"; | 8 import "package:expect/expect.dart"; |
9 | 9 |
10 // Determine whether the VM is running in checked mode. | 10 // Determine whether the VM is running in checked mode. |
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60 void set a(A value) {} | 60 void set a(A value) {} |
61 | 61 |
62 B get b => null; | 62 B get b => null; |
63 | 63 |
64 void set b(B value) {} | 64 void set b(B value) {} |
65 } | 65 } |
66 | 66 |
67 class DerivedClass extends ClassWithInstanceGetters { | 67 class DerivedClass extends ClassWithInstanceGetters { |
68 dynamic get a => bad(); | 68 dynamic get a => bad(); |
69 | 69 |
70 void set a(dynamic value) { | 70 void set a(dynamic value) { bad(); } |
71 bad(); | |
72 } | |
73 | 71 |
74 dynamic get b => bad(); | 72 dynamic get b => bad(); |
75 | 73 |
76 void set b(dynamic value) { | 74 void set b(dynamic value) { bad(); } |
77 bad(); | |
78 } | |
79 | 75 |
80 void derivedTest() { | 76 void derivedTest() { |
81 // The static type of super.v ??= e is the LUB of the static types of | 77 // The static type of super.v ??= e is the LUB of the static types of |
82 // super.v and e. | 78 // super.v and e. |
83 (super.a ??= new A()).a; //# 01: ok | 79 (super.a ??= new A()).a; //# 01: ok |
84 Expect.throws(() => (super.a ??= new A()).b, noMethod); //# 02: static type
warning | 80 Expect.throws(() => (super.a ??= new A()).b, noMethod); //# 02: static type
warning |
85 (super.a ??= new B()).a; //# 03: ok | 81 (super.a ??= new B()).a; //# 03: ok |
86 (super.a ??= new B()).b; //# 04: static type warning | 82 (super.a ??= new B()).b; //# 04: static type warning |
87 if (!checkedMode) { | 83 if (!checkedMode) { |
88 (super.b ??= new A()).a; //# 05: ok | 84 (super.b ??= new A()).a; //# 05: ok |
89 Expect.throws(() => (super.b ??= new A()).b, noMethod); //# 06: static typ
e warning | 85 Expect.throws(() => (super.b ??= new A()).b, noMethod); //# 06: static typ
e warning |
90 | 86 |
91 // Exactly the same static warnings that would be caused by super.v = e | 87 // Exactly the same static warnings that would be caused by super.v = e |
92 // are also generated in the case of super.v ??= e. | 88 // are also generated in the case of super.v ??= e. |
93 super.b ??= new C(); //# 07: static type warning | 89 super.b ??= new C(); //# 07: static type warning |
94 } | 90 } |
95 } | 91 } |
96 } | 92 } |
97 | 93 |
98 main() { | 94 main() { |
99 // Make sure the "none" test fails if "??=" is not implemented. This makes | 95 // Make sure the "none" test fails if "??=" is not implemented. This makes |
100 // status files easier to maintain. | 96 // status files easier to maintain. |
101 var _; | 97 var _; _ ??= null; |
102 _ ??= null; | |
103 | 98 |
104 new DerivedClass().derivedTest(); | 99 new DerivedClass().derivedTest(); |
105 | 100 |
106 // The static type of v ??= e is the LUB of the static types of v and e. | 101 // The static type of v ??= e is the LUB of the static types of v and e. |
107 (a ??= new A()).a; //# 08: ok | 102 (a ??= new A()).a; //# 08: ok |
108 Expect.throws(() => (a ??= new A()).b, noMethod); //# 09: static type warning | 103 Expect.throws(() => (a ??= new A()).b, noMethod); //# 09: static type warning |
109 (a ??= new B()).a; //# 10: ok | 104 (a ??= new B()).a; //# 10: ok |
110 (a ??= new B()).b; //# 11: static type warning | 105 (a ??= new B()).b; //# 11: static type warning |
111 if (!checkedMode) { | 106 if (!checkedMode) { |
112 (b ??= new A()).a; //# 12: ok | 107 (b ??= new A()).a; //# 12: ok |
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170 (new ClassWithInstanceGetters()?.a ??= new B()).b; //# 39: static type warning | 165 (new ClassWithInstanceGetters()?.a ??= new B()).b; //# 39: static type warning |
171 if (!checkedMode) { | 166 if (!checkedMode) { |
172 (new ClassWithInstanceGetters()?.b ??= new A()).a; //# 40: ok | 167 (new ClassWithInstanceGetters()?.b ??= new A()).a; //# 40: ok |
173 Expect.throws(() => (new ClassWithInstanceGetters()?.b ??= new A()).b, noMet
hod); //# 41: static type warning | 168 Expect.throws(() => (new ClassWithInstanceGetters()?.b ??= new A()).b, noMet
hod); //# 41: static type warning |
174 | 169 |
175 // Exactly the same static warnings that would be caused by e1.v ??= e2 are | 170 // Exactly the same static warnings that would be caused by e1.v ??= e2 are |
176 // also generated in the case of e1?.v ??= e2. | 171 // also generated in the case of e1?.v ??= e2. |
177 new ClassWithInstanceGetters()?.b ??= new C(); //# 42: static type warning | 172 new ClassWithInstanceGetters()?.b ??= new C(); //# 42: static type warning |
178 } | 173 } |
179 } | 174 } |
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