#3698. Add/update tests for execution

Language/Statements/Return/execution_A01_t04.dart

@@ -0,0 +1,54 @@
+// Copyright (c) 2026, 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 The execution of a return statement proceeds as follows.
+///
+/// Case ⟨Synchronous non-generator functions and factory constructors⟩. Let `s`
+/// be a statement of the form `return e;`. Let `f` be the immediately enclosing
+/// function, and consider the case where `f` is a synchronous non-generator or
+/// a factory constructor. Execution of `s` proceeds as follows.
+///
+/// The expression `e` is evaluated to an object `o`. A dynamic error occurs
+/// unless the dynamic type of `o` is a subtype of the actual return type of `f`.
+/// Then the return statement `s` completes returning `o`.
+///
+/// @description Checks that no error occurs if the run-time type of `e` is a
+/// subtype of the actual return type of `f`.
+/// @author sgrekhov22@gmail.com
+
+import 'dart:async';
+import '../../../Utils/expect.dart';
+
+num f1() {
+  return 1 as dynamic;
+}
+
+num f2() {
+  return 3.14 as dynamic;
+}
+
+num? f3() {
+  return null as dynamic;
+}
+
+FutureOr<num> f4() {
+  return 4;
+}
+
+FutureOr<num> f5() {
+  return Future<num>.value(5);
+}
+
+int f6(v) {
+  return v;
+}
+
+main() async {
+  Expect.equals(1, f1());
+  Expect.equals(3.14, f2());
+  Expect.isNull(f3());
+  Expect.equals(4, f4());
+  Expect.equals(5, await f5());
+  Expect.equals(6, f6(6 as num));
+}

Language/Statements/Return/execution_A01_t05.dart

@@ -0,0 +1,34 @@
+// Copyright (c) 2026, 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 The execution of a return statement proceeds as follows.
+///
+/// Case ⟨Synchronous non-generator functions and factory constructors⟩. Let `s`
+/// be a statement of the form `return e;`. Let `f` be the immediately enclosing
+/// function, and consider the case where `f` is a synchronous non-generator or
+/// a factory constructor. Execution of `s` proceeds as follows.
+///
+/// The expression `e` is evaluated to an object `o`. A dynamic error occurs
+/// unless the dynamic type of `o` is a subtype of the actual return type of `f`.
+/// Then the return statement `s` completes returning `o`.
+///
+/// @description Checks that it is dynamic error if the run-time type of `e` is
+/// not a subtype of the actual return type of `f`.
+/// @author sgrekhov22@gmail.com
+
+import 'dart:async';
+import '../../../Utils/expect.dart';
+
+int foo(v) {
+  return v;
+}
+
+main() async {
+  Expect.throws(() {
+    foo(3.14);
+  });
+  Expect.throws(() {
+    foo(null);
+  });
+}

Language/Statements/Return/execution_A02_t01.dart

@@ -0,0 +1,60 @@
+// Copyright (c) 2026, 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 The execution of a return statement proceeds as follows.
+/// ...
+/// Case ⟨Asynchronous non-generator functions⟩. Let `s` be a statement of the
+/// form return `e;`. Let `f` be the immediately enclosing function, and
+/// consider the case where `f` is an asynchronous non-generator with future
+/// value type `Tv`.
+///
+/// Execution of `s` proceeds as follows.
+///
+/// The expression `e` is evaluated to an object `o`. If the run-time type of
+/// `o` is a subtype of `Future<Tv>`, let `v` be a fresh variable bound to `o`
+/// and evaluate `await v` to an object `r`; otherwise let `r` be `o`. A dynamic
+/// error occurs unless the dynamic type of `r` is a subtype of the actual value
+/// of `Tv`. Then the return statement `s` completes returning `r`.
+///
+/// @description Checks that if the run-time type of `o` is a subtype of
+/// `Future<Tv>` then the result of `await v;` is returned.
+/// @author sgrekhov22@gmail.com
+
+import 'dart:async';
+import '../../../Utils/expect.dart';
+
+Future<T> r<T>(T v) async => v;
+
+Future<num> foo() async {
+  return r<int>(1);
+}
+
+FutureOr<num> bar() async {
+  return r<int>(2);
+}
+
+Future<num> baz() async {
+  return 3;
+}
+
+FutureOr<num> qux() async {
+  return 4;
+}
+
+FutureOr<Object> quux() async {
+  return r<Object>(5);
+}
+
+main() async {
+  Expect.notEquals(await r(1), foo()); // The expected values are directly based on the specified behavior
+  Expect.equals(await r(1), await foo());
+  Expect.notEquals(await r(2), bar());
+  Expect.equals(await r(2), await bar());
+  Expect.notEquals(3, baz());
+  Expect.equals(3, await baz());
+  Expect.notEquals(4, qux());
+  Expect.equals(4, await qux());
+  Expect.notEquals(await r(5), quux());
+  Expect.equals(await r(5), await quux());
+}

Language/Statements/Return/execution_A02_t02.dart

@@ -0,0 +1,54 @@
+// Copyright (c) 2026, 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 The execution of a return statement proceeds as follows.
+/// ...
+/// Case ⟨Asynchronous non-generator functions⟩. Let `s` be a statement of the
+/// form return `e;`. Let `f` be the immediately enclosing function, and
+/// consider the case where `f` is an asynchronous non-generator with future
+/// value type `Tv`.
+///
+/// Execution of `s` proceeds as follows.
+///
+/// The expression `e` is evaluated to an object `o`. If the run-time type of
+/// `o` is a subtype of `Future<Tv>`, let `v` be a fresh variable bound to `o`
+/// and evaluate `await v` to an object `r`; otherwise let `r` be `o`. A dynamic
+/// error occurs unless the dynamic type of `r` is a subtype of the actual value
+/// of `Tv`. Then the return statement `s` completes returning `r`.
+///
+/// @description Checks that if the run-time type of `o` is a not a subtype of
+/// `Future<Tv>` and not a subtype of `Tv` then dynamic error occurs.
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/expect.dart';
+
+Future<T> r<T>(T r) async => r;
+
+Future<int> foo() async {
+  return r<num>(1) as dynamic;
+}
+
+Future<int> bar() async {
+  return 3.14 as dynamic;
+}
+
+main() async {
+  var success = false;
+  asyncStart(2);
+  foo().then((_) {
+    success = true;
+  }).onError((_, _) {
+    asyncEnd();
+  }).whenComplete(() {
+    Expect.isFalse(success);
+  });
+
+  bar().then((_) {
+    success = true;
+  }).onError((_, _) {
+    asyncEnd();
+  }).whenComplete(() {
+    Expect.isFalse(success);
+  });
+}

Language/Statements/Return/execution_A02_t03.dart

@@ -0,0 +1,36 @@
+// Copyright (c) 2026, 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 The execution of a return statement proceeds as follows.
+/// ...
+/// Case ⟨Asynchronous non-generator functions⟩. Let `s` be a statement of the
+/// form return `e;`. Let `f` be the immediately enclosing function, and
+/// consider the case where `f` is an asynchronous non-generator with future
+/// value type `Tv`.
+///
+/// Execution of `s` proceeds as follows.
+///
+/// The expression `e` is evaluated to an object `o`. If the run-time type of
+/// `o` is a subtype of `Future<Tv>`, let `v` be a fresh variable bound to `o`
+/// and evaluate `await v` to an object `r`; otherwise let `r` be `o`. A dynamic
+/// error occurs unless the dynamic type of `r` is a subtype of the actual value
+/// of `Tv`. Then the return statement `s` completes returning `r`.
+///
+/// @description Checks that if a return statement is executing in a try-finally
+/// block then finally is also executed.
+/// @author sgrekhov22@gmail.com
+
+import '../../../Utils/expect.dart';
+
+Future<num> foo() async {
+  try {
+    return 1;
+  } finally {
+    return 2;
+  }
+}
+
+main() async {
+  Expect.equals(2, await foo());
+}

Language/Statements/Return/execution_A02_t04.dart

@@ -0,0 +1,50 @@
+// Copyright (c) 2026, 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 The execution of a return statement proceeds as follows.
+/// ...
+/// Case ⟨Asynchronous non-generator functions⟩. Let `s` be a statement of the
+/// form return `e;`. Let `f` be the immediately enclosing function, and
+/// consider the case where `f` is an asynchronous non-generator with future
+/// value type `Tv`.
+///
+/// Execution of `s` proceeds as follows.
+///
+/// The expression `e` is evaluated to an object `o`. If the run-time type of
+/// `o` is a subtype of `Future<Tv>`, let `v` be a fresh variable bound to `o`
+/// and evaluate `await v` to an object `r`; otherwise let `r` be `o`. A dynamic
+/// error occurs unless the dynamic type of `r` is a subtype of the actual value
+/// of `Tv`. Then the return statement `s` completes returning `r`.
+///
+/// @description Checks that if the run-time type of `o` is a not a subtype of
+/// `Future<Tv>` then dynamic error occurs.
+/// @author sgrekhov22@gmail.com
+/// @issue 44395
+
+import '../../../Utils/expect.dart';
+
+Future<T> r<T>(T r) async => r;
+
+Future<int> foo() async {
+  try {
+    return r<num>(1) as dynamic;
+  } on Error {
+    return 2;
+  }
+}
+
+Future<int> bar() async {
+  try {
+    return r<num>(1) as dynamic;
+  } on Error {
+    return 2;
+  } finally {
+    return 3;
+  }
+}
+
+main() async {
+  Expect.equals(2, await foo());
+  Expect.equals(3, await bar());
+}

Language/Statements/Return/execution_t01.dart

@@ -2,21 +2,17 @@
 // 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 Executing a return statement `return e;` proceeds as follows:
+/// @assertion The execution of a return statement proceeds as follows.
+///
+/// Case ⟨Synchronous non-generator functions and factory constructors⟩. Let `s`
+/// be a statement of the form `return e;`. Let `f` be the immediately enclosing
+/// function, and consider the case where `f` is a synchronous non-generator or
+/// a factory constructor. Execution of `s` proceeds as follows.
 ///
-/// When `f` is a synchronous non-generator, evaluation proceeds as follows:
 /// The expression `e` is evaluated to an object `o`. A dynamic error occurs
 /// unless the dynamic type of `o` is a subtype of the actual return type of `f`.
 /// Then the return statement `s` completes returning `o`.
 ///
-/// When `f` is an asynchronous non-generator with future value type `T`,
-/// evaluation proceeds as follows:
-/// The expression `e` is evaluated to an object `o`. If the run-time type of
-/// `o` is a subtype of `Future<T>`,let `v` be a fresh variable bound to `o` and
-/// evaluate `await v` to an object `r`; otherwise let `r` be `o`. A dynamic
-/// error occurs unless the dynamic type of `r` is a subtype of the actual value
-/// of `T`. Then the return statement `s` completes returning `r`.
-///
 /// @description Checks that the return statement returns a value received after
 /// evaluating the return expression and if this evaluation results in a runtime
 /// exception the control is transferred to the appropriate handler.
@@ -34,7 +30,7 @@ bar(x) {
 
 class A {
   run() {
-    throw 1;
+    return throw 1;
   }
 }
 

Language/Statements/Return/execution_t02.dart

@@ -2,21 +2,17 @@
 // 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 Executing a return statement `return e;` proceeds as follows:
+/// @assertion The execution of a return statement proceeds as follows.
+///
+/// Case ⟨Synchronous non-generator functions and factory constructors⟩. Let `s`
+/// be a statement of the form `return e;`. Let `f` be the immediately enclosing
+/// function, and consider the case where `f` is a synchronous non-generator or
+/// a factory constructor. Execution of `s` proceeds as follows.
 ///
-/// When `f` is a synchronous non-generator, evaluation proceeds as follows:
 /// The expression `e` is evaluated to an object `o`. A dynamic error occurs
 /// unless the dynamic type of `o` is a subtype of the actual return type of `f`.
 /// Then the return statement `s` completes returning `o`.
 ///
-/// When `f` is an asynchronous non-generator with future value type `T`,
-/// evaluation proceeds as follows:
-/// The expression `e` is evaluated to an object `o`. If the run-time type of
-/// `o` is a subtype of `Future<T>`,let `v` be a fresh variable bound to `o` and
-/// evaluate `await v` to an object `r`; otherwise let `r` be `o`. A dynamic
-/// error occurs unless the dynamic type of `r` is a subtype of the actual value
-/// of `T`. Then the return statement `s` completes returning `r`.
-///
 /// @description Checks that a `finally` statement is executed if the control is
 /// transferred from a try block using a `return` statement.
 /// @author iefremov

Language/Statements/Return/execution_t03.dart

@@ -2,21 +2,17 @@
 // 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 Executing a return statement `return e;` proceeds as follows:
+/// @assertion The execution of a return statement proceeds as follows.
+///
+/// Case ⟨Synchronous non-generator functions and factory constructors⟩. Let `s`
+/// be a statement of the form `return e;`. Let `f` be the immediately enclosing
+/// function, and consider the case where `f` is a synchronous non-generator or
+/// a factory constructor. Execution of `s` proceeds as follows.
 ///
-/// When `f` is a synchronous non-generator, evaluation proceeds as follows:
 /// The expression `e` is evaluated to an object `o`. A dynamic error occurs
 /// unless the dynamic type of `o` is a subtype of the actual return type of `f`.
 /// Then the return statement `s` completes returning `o`.
 ///
-/// When `f` is an asynchronous non-generator with future value type `T`,
-/// evaluation proceeds as follows:
-/// The expression `e` is evaluated to an object `o`. If the run-time type of
-/// `o` is a subtype of `Future<T>`,let `v` be a fresh variable bound to `o` and
-/// evaluate `await v` to an object `r`; otherwise let `r` be `o`. A dynamic
-/// error occurs unless the dynamic type of `r` is a subtype of the actual value
-/// of `T`. Then the return statement `s` completes returning `r`.
-///
 /// @description Checks that a finally statement is executed if the control
 /// is transferred from a try block using a return statement.
 /// @author iefremov