Fixes #2384. Fix not well-bound extension types. Add function-type dynamic test (#2387)

Test bound errors with extension types . Add function-type dynamic test.

Author: sgrekhov

LanguageFeatures/Extension-types/dynamic_semantics_extension_type_A01_t02.dart

@@ -0,0 +1,33 @@
+// Copyright (c) 2023, 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 At run time, for a given instance o typed as an extension type V,
+/// there is no reification of V associated with o.
+///
+/// @description Check that an extension type is 'erased' at run time
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=inline-class
+
+import "../../Utils/expect.dart";
+
+extension type ET1(int id) {
+  int add(int other) => id + other;
+}
+
+extension type ET2<T>(T id) {
+  bool equal(T other) => id == other;
+}
+
+main() {
+  dynamic d1 = ET1(1);
+  Expect.throws(() {d1.id;});
+  Expect.throws(() {d1.add(1);});
+  dynamic d2 = ET2(1);
+  Expect.throws(() {d2.id;});
+  Expect.throws(() {d2.equal(1);});
+  dynamic d3 = ET2<int>(1);
+  Expect.throws(() {d3.id;});
+  Expect.throws(() {d3.equal(1);});
+}

LanguageFeatures/Extension-types/dynamic_semantics_member_invocation_A03_t05.dart

@@ -0,0 +1,47 @@
+// Copyright (c) 2023, 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 an invocation of the extension type member m on the
+/// receiver expression e according to the extension type declaration V with
+/// actual type arguments T1, ..., Ts. If the invocation includes an actual
+/// argument part (possibly including some actual type arguments) then call it
+/// args. If the invocation omits args, but includes a list of actual type
+/// arguments then call them typeArgs. Assume that V declares the type variables
+/// X1, ..., Xs
+/// ...
+/// Let Dm be the unique declaration named m that V has.
+///
+/// Evaluation of this invocation proceeds by evaluating e to an object o.
+/// ...
+/// Otherwise, the following is known: args is included, and Dm is a method. The
+/// invocation proceeds to evaluate args to an actual argument list args1. Then
+/// it executes the body of Dm in an environment where this and the name of the
+/// representation are bound in the same way as in the getter invocation, the
+/// type variables of V are bound to the actual values of T1, .. Ts, and the
+/// formal parameters of m are bound to args1 in the same way that they would be
+/// bound for a normal function call. If the body completes returning an object
+/// o2 then the invocation evaluates to o2. If the body throws an object and a
+/// stack trace then the invocation completes throwing the same object and stack
+/// trace.
+///
+/// @description Check invocation of a representation type `call` member
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=inline-class
+
+import "../../Utils/expect.dart";
+
+extension type V1<T extends Object Function(num)>(T id) {}
+
+typedef num Foo(Object o);
+
+Foo foo = (Object o) => o as num;
+
+main() {
+  Expect.equals(42, V1<Foo>(foo).id(42));
+  Expect.equals(42, V1<Foo>(foo).id.call(42));
+  dynamic d = V1<Foo>(foo);
+  Expect.equals(42, d(42));
+  Expect.equals(42, d.call(42));
+}

LanguageFeatures/Extension-types/dynamic_semantics_member_invocation_A03_t06.dart

@@ -0,0 +1,48 @@
+// Copyright (c) 2023, 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 an invocation of the extension type member m on the
+/// receiver expression e according to the extension type declaration V with
+/// actual type arguments T1, ..., Ts. If the invocation includes an actual
+/// argument part (possibly including some actual type arguments) then call it
+/// args. If the invocation omits args, but includes a list of actual type
+/// arguments then call them typeArgs. Assume that V declares the type variables
+/// X1, ..., Xs
+/// ...
+/// Let Dm be the unique declaration named m that V has.
+///
+/// Evaluation of this invocation proceeds by evaluating e to an object o.
+/// ...
+/// Otherwise, the following is known: args is included, and Dm is a method. The
+/// invocation proceeds to evaluate args to an actual argument list args1. Then
+/// it executes the body of Dm in an environment where this and the name of the
+/// representation are bound in the same way as in the getter invocation, the
+/// type variables of V are bound to the actual values of T1, .. Ts, and the
+/// formal parameters of m are bound to args1 in the same way that they would be
+/// bound for a normal function call. If the body completes returning an object
+/// o2 then the invocation evaluates to o2. If the body throws an object and a
+/// stack trace then the invocation completes throwing the same object and stack
+/// trace.
+///
+/// @description Check invocation of an extension type `call` member
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=inline-class
+
+import "../../Utils/expect.dart";
+
+extension type ET1(int id) {
+  int call(int other) => id + other;
+}
+
+extension type ET2<T>(T id) {
+  T call() => id;
+}
+
+main() {
+  Expect.equals(3, ET1(1).call(2));
+  Expect.equals(5, ET1(2)(3));
+  Expect.equals("42", ET2<String>("42").call());
+  Expect.equals("42", ET2<String>("42")());
+}

LanguageFeatures/Extension-types/static_analysis_extension_types_A05_t02.dart

@@ -14,16 +14,19 @@
 /// regular-bounded.
 ///
 /// @description Checks that it is a compile-time error if the type
-/// `V<T1, .. Ts>` is not regular-bounded.
+/// `V<T1, .. Ts>` has type bound like V<T extends V<T>> (after extension type
+/// erasure it become `extension type V<T extends T>(T id) {}` which is an
+/// error)
 /// @author [email protected]
+/// @issue 54097
 
 // SharedOptions=--enable-experiment=inline-class
 
 extension type V<T extends V<T>>(T id) {}
-
-main() {
-  List<V> l = [];
-//     ^
+//               ^
 // [analyzer] unspecified
 // [cfe] unspecified
+
+main() {
+  print(V<Never>);
 }

LanguageFeatures/Extension-types/static_analysis_extension_types_A05_t04.dart

@@ -0,0 +1,36 @@
+// Copyright (c) 2023, 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 Assume that T1, .. Ts are types, and V resolves to an extension
+/// type declaration of the following form:
+///
+/// extension type V<X1 extends B1, .. Xs extends Bs>(T id) ... {
+///   ... // Members.
+/// }
+/// ...
+/// A compile-time error occurs if the type V<T1, .. Tk> provides a wrong number
+/// of type arguments to V (when k is different from s), and if it is not
+/// regular-bounded.
+///
+/// @description Checks that it is a compile-time error if an extension type
+/// `V<T1, .. Ts>` has any dependency cycles in type bounds
+/// @author [email protected]
+/// @issue 54097
+
+// SharedOptions=--enable-experiment=inline-class
+
+extension type V1<T extends T>(T id) {}
+//               ^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+extension type V2<T1 extends T2, T2 extends T1>(T1 id) {}
+//                ^
+// [analyzer] unspecified
+// [cfe] unspecified
+
+main() {
+  print(V1<Never>);
+  print(V2<Never, Never>);
+}