#3054. Add generic method instantiation tests (#3062)

Add generic method instantiation tests

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A01_t01.dart

@@ -0,0 +1,49 @@
+// Copyright (c) 2025, 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.
+
+/// @assertion Let `i` be a property extraction expression of the form `e?.id`,
+/// `e.id`, or `super.id`, which is statically resolved to denote an instance
+/// method named `id`, and let `G` be the static type of `i`. Consider the
+/// situation where `G` is a function type of the form
+/// `T0 Function<X1 ◁B1, ..., Xs ◁Bs>(parameters)` with `s > 0` (that is, `G` is
+/// a generic function type), and the context type is a non-generic function
+/// type `F`. In this situation a compile-time error occurs, except when generic
+/// function type instantiation succeeds, that is:
+///
+/// Type inference is applied to `G` with context type `F`, and it succeeds,
+/// yielding the actual type argument list `T1, ..., Ts`.
+///
+/// @description Check that it is a compile-time error if a generic method
+/// tear-off cannot be assigned to a non-generic function.
+/// @author [email protected]
+
+class C1 {
+  X foo<X extends num>(X x) => x;
+}
+
+class C2<T extends num> {
+  X foo<X extends T>(X x) => x;
+}
+
+void main() {
+  C1 c1 = C1();
+  String Function(int) f1 = c1.foo;
+//                          ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  int Function(num) f2 = c1.foo;
+//                       ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+  var c2 = C2<int>();
+  String Function(int) f3 = c2.foo;
+//                          ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  int Function(num) f4 = c2.foo;
+//                       ^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A01_t02.dart

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+// Copyright (c) 2025, 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.
+
+/// @assertion Let `i` be a property extraction expression of the form `e?.id`,
+/// `e.id`, or `super.id`, which is statically resolved to denote an instance
+/// method named `id`, and let `G` be the static type of `i`. Consider the
+/// situation where `G` is a function type of the form
+/// `T0 Function<X1 ◁B1, ..., Xs ◁Bs>(parameters)` with `s > 0` (that is, `G` is
+/// a generic function type), and the context type is a non-generic function
+/// type `F`. In this situation a compile-time error occurs, except when generic
+/// function type instantiation succeeds, that is:
+///
+/// Type inference is applied to `G` with context type `F`, and it succeeds,
+/// yielding the actual type argument list `T1, ..., Ts`.
+///
+/// @description Check that it is a run-time error if a generic method
+/// tear-off cannot be assigned to a non-generic function.
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class C<T extends num> {
+  X foo<X extends T>(X x) => x;
+}
+
+void main() {
+  C<num> c = C<int>();
+  Expect.throws(() {
+    num Function(num) f = c.foo;
+  });
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A01_t03.dart

@@ -0,0 +1,36 @@
+// Copyright (c) 2025, 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.
+
+/// @assertion Let `i` be a property extraction expression of the form `e?.id`,
+/// `e.id`, or `super.id`, which is statically resolved to denote an instance
+/// method named `id`, and let `G` be the static type of `i`. Consider the
+/// situation where `G` is a function type of the form
+/// `T0 Function<X1 ◁B1, ..., Xs ◁Bs>(parameters)` with `s > 0` (that is, `G` is
+/// a generic function type), and the context type is a non-generic function
+/// type `F`. In this situation a compile-time error occurs, except when generic
+/// function type instantiation succeeds, that is:
+///
+/// Type inference is applied to `G` with context type `F`, and it succeeds,
+/// yielding the actual type argument list `T1, ..., Ts`.
+///
+/// @description Check that it is not an error if a type inference is applied to
+/// `G` with context type `F`, and it succeeds
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class A {
+  X fi<X extends num>(X x) => x;
+}
+
+class B extends A {
+  X fi<X extends num>(X x, [List<X>? xs]) => x;
+}
+
+void main() {
+  A a = B();
+  int Function(int) f = a.fi;
+  Expect.equals(42, f(42));
+  Expect.equals(42, (f as dynamic)(42, [0]));
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A02_t01.dart

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+// Copyright (c) 2025, 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.
+
+/// @assertion Let `i` be a property extraction expression of the form `e?.id`,
+/// `e.id`, or `super.id`, which is statically resolved to denote an instance
+/// method named `id`, and let `G` be the static type of `i`. Consider the
+/// situation where `G` is a function type of the form
+/// `T0 Function<X1 ◁B1, ..., Xs ◁Bs>(parameters)` with `s > 0` (that is, `G` is
+/// a generic function type), and the context type is a non-generic function
+/// type `F`.
+/// ...
+/// Consider the situation where generic function type instantiation succeeded.
+/// Let `gmiNameid` be a fresh name which is associated with `id`, which is
+/// private `if` and only if id is private.
+/// ...
+/// The program is then modified as follows:
+/// • When `i` is `e?.id`: Replace `i` by `e?.gmiNameid<T1, ..., Ts>()`.
+/// • When `i` is `e.id`: Replace `i` by `e.gmiNameid<T1, ..., Ts>()`.
+/// • When `i` is `super.id`: Replace `i` by `super.gmiNameid<T1, ..., Ts>()`.
+///
+/// @description Check that generic method instantiation may have a form `e?.id`
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class C {
+  int v;
+  C(this.v);
+  X foo<X extends num>(X x) => x + v as X;
+}
+
+void main() {
+  C? c1 = 2 > 1 ? C(1) : null;
+  int Function(int)? f1 = c1?.foo;
+  Expect.equals(c1?.foo(42), f1?.call(42));
+
+  C? c2 = 1 > 2 ? C(1) : null;
+  double Function(double)? f2 = c2?.foo;
+  Expect.isNull(f2);
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A02_t02.dart

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+// Copyright (c) 2025, 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.
+
+/// @assertion Let `i` be a property extraction expression of the form `e?.id`,
+/// `e.id`, or `super.id`, which is statically resolved to denote an instance
+/// method named `id`, and let `G` be the static type of `i`. Consider the
+/// situation where `G` is a function type of the form
+/// `T0 Function<X1 ◁B1, ..., Xs ◁Bs>(parameters)` with `s > 0` (that is, `G` is
+/// a generic function type), and the context type is a non-generic function
+/// type `F`.
+/// ...
+/// Consider the situation where generic function type instantiation succeeded.
+/// Let `gmiNameid` be a fresh name which is associated with `id`, which is
+/// private `if` and only if id is private.
+/// ...
+/// The program is then modified as follows:
+/// • When `i` is `e?.id`: Replace `i` by `e?.gmiNameid<T1, ..., Ts>()`.
+/// • When `i` is `e.id`: Replace `i` by `e.gmiNameid<T1, ..., Ts>()`.
+/// • When `i` is `super.id`: Replace `i` by `super.gmiNameid<T1, ..., Ts>()`.
+///
+/// @description Check that generic method instantiation may have a form `e.id`.
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class C<T extends num> {
+  int v;
+  C(this.v);
+  X foo<X extends T>(X x) => x + v as X;
+}
+
+void main() {
+  C c1 = C(1);
+  int Function(int) f1 = c1.foo;
+  Expect.equals(c1.foo(42), f1(42));
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A02_t03.dart

@@ -0,0 +1,45 @@
+// Copyright (c) 2025, 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.
+
+/// @assertion Let `i` be a property extraction expression of the form `e?.id`,
+/// `e.id`, or `super.id`, which is statically resolved to denote an instance
+/// method named `id`, and let `G` be the static type of `i`. Consider the
+/// situation where `G` is a function type of the form
+/// `T0 Function<X1 ◁B1, ..., Xs ◁Bs>(parameters)` with `s > 0` (that is, `G` is
+/// a generic function type), and the context type is a non-generic function
+/// type `F`.
+/// ...
+/// Consider the situation where generic function type instantiation succeeded.
+/// Let `gmiNameid` be a fresh name which is associated with `id`, which is
+/// private `if` and only if id is private.
+/// ...
+/// The program is then modified as follows:
+/// • When `i` is `e?.id`: Replace `i` by `e?.gmiNameid<T1, ..., Ts>()`.
+/// • When `i` is `e.id`: Replace `i` by `e.gmiNameid<T1, ..., Ts>()`.
+/// • When `i` is `super.id`: Replace `i` by `super.gmiNameid<T1, ..., Ts>()`.
+///
+/// @description Check that generic method instantiation may have a form
+/// `super.id`.
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class A {
+  String foo<X>(X x) => "A:$X";
+}
+
+class C extends A {
+  int v;
+  C(this.v);
+  String foo<X>(X x) => "C:$X";
+
+  test() {
+    String Function(int) f1 = super.foo;
+    Expect.equals("A:int", f1(42));
+  }
+}
+
+void main() {
+  C(1).test();
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A03_t01.dart

@@ -0,0 +1,45 @@
+// Copyright (c) 2025, 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.
+
+/// @assertion Consider the situation where generic function type instantiation
+/// succeeded. Let `gmiNameid` be a fresh name which is associated with `id`,
+/// which is private `if` and only if id is private.
+/// ...
+/// Let `o` be an instance of a class which contains an implicitly induced
+/// declaration of `gmiNameid` as described above. Consider the situation where
+/// the program evaluates two invocations of this method with the same receiver
+/// `o`, and with actual type arguments whose actual values are the same types
+/// `t1, ..., ts` for both invocations, and assume that the invocations returned
+/// the instances `o1` respectively `o2`. It is then guaranteed that `o1` and
+/// `o2` are equal according to operator ‘==’.
+///
+/// @description Check that two generic method instantiation of the same method
+/// of a form `e?.id` are equal according to the `==` operator.
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class C1 {
+  int v;
+  C1(this.v);
+  X foo<X extends num>(X x) => x + v as X;
+}
+
+class C2<T extends num> {
+  T v;
+  C2(this.v);
+  X foo<X extends T>(X x) => x + v as X;
+}
+
+void main() {
+  C1? c1 = 2 > 1 ? C1(1) : null;
+  int Function(int)? f1 = c1?.foo;
+  int Function(int)? f2 = c1?.foo;
+  Expect.isTrue(f1 == f2);
+
+  C2<num>? c2 = 2 > 1 ? C2(2) : null;
+  int Function(int)? f3 = c2?.foo;
+  int Function(int)? f4 = c2?.foo;
+  Expect.isTrue(f3 == f4);
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A03_t02.dart

@@ -0,0 +1,45 @@
+// Copyright (c) 2025, 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.
+
+/// @assertion Consider the situation where generic function type instantiation
+/// succeeded. Let `gmiNameid` be a fresh name which is associated with `id`,
+/// which is private `if` and only if id is private.
+/// ...
+/// Let `o` be an instance of a class which contains an implicitly induced
+/// declaration of `gmiNameid` as described above. Consider the situation where
+/// the program evaluates two invocations of this method with the same receiver
+/// `o`, and with actual type arguments whose actual values are the same types
+/// `t1, ..., ts` for both invocations, and assume that the invocations returned
+/// the instances `o1` respectively `o2`. It is then guaranteed that `o1` and
+/// `o2` are equal according to operator ‘==’.
+///
+/// @description Check that two generic method instantiation of the same method
+/// of a form `e.id` are equal according to the `==` operator.
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class C1 {
+  int v;
+  C1(this.v);
+  X foo<X extends num>(X x) => x + v as X;
+}
+
+class C2<T extends num> {
+  T v;
+  C2(this.v);
+  X foo<X extends T>(X x) => x + v as X;
+}
+
+void main() {
+  var c1 = C1(1);
+  int Function(int) f1 = c1.foo;
+  int Function(int) f2 = c1.foo;
+  Expect.isTrue(f1 == f2);
+
+  var c2 = C2<num>(2);
+  int Function(int) f3 = c2.foo;
+  int Function(int) f4 = c2.foo;
+  Expect.isTrue(f3 == f4);
+}

Language/Expressions/Property_Extraction/Generic_Method_Instantiation/generic_method_A03_t03.dart

@@ -0,0 +1,41 @@
+// Copyright (c) 2025, 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.
+
+/// @assertion Consider the situation where generic function type instantiation
+/// succeeded. Let `gmiNameid` be a fresh name which is associated with `id`,
+/// which is private `if` and only if id is private.
+/// ...
+/// Let `o` be an instance of a class which contains an implicitly induced
+/// declaration of `gmiNameid` as described above. Consider the situation where
+/// the program evaluates two invocations of this method with the same receiver
+/// `o`, and with actual type arguments whose actual values are the same types
+/// `t1, ..., ts` for both invocations, and assume that the invocations returned
+/// the instances `o1` respectively `o2`. It is then guaranteed that `o1` and
+/// `o2` are equal according to operator ‘==’.
+///
+/// @description Check that two generic method instantiation of the same method
+/// of a form `super.id` are equal according to the `==` operator.
+/// @author [email protected]
+
+import '../../../../Utils/expect.dart';
+
+class A {
+  X foo<X extends num>(X x) => x;
+}
+
+class C extends A {
+  int v;
+  C(this.v);
+  X foo<X extends num>(X x) => x + v as X;
+
+  void test() {
+    int Function(int) f1 = super.foo;
+    int Function(int) f2 = super.foo;
+    Expect.isTrue(f1 == f2);
+  }
+}
+
+void main() {
+  C(1).test();
+}