dart-lang#2138. Add more tests for call method/getter (dart-lang#3053)

Add more tests for `call` method/getter

Language/Expressions/Function_Invocation/Function_Expression_Invocation/call_A04_t01.dart

@@ -0,0 +1,182 @@
+// 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 A function expression invocation i has the form
+/// ef <A1, . . . , Ar>(a1, . . . , an, xn+1: an+1, . . . , xn+k: an+k),
+/// where ef is an expression.
+/// ...
+/// Let F be the static type of ef . If F is an interface type that has a method
+/// named call, i is treated as the ordinary invocation
+/// ef .call<A1, . . . , Ar>(a1, . . . , an, xn+1: an+1, . . . , xn+k: an+k)
+///
+/// @description Checks that an implicit invocation of a `.call()` invokes an
+/// appropriate function.
+/// @author [email protected]
+/// @author lrhn
+/// @issue 59952
+
+// See https://github.com/dart-lang/sdk/issues/55803#issuecomment-2124182059
+
+import '../../../../Utils/expect.dart';
+
+void main() {
+  // Real functions, invoked typed or dynamic.
+  check = expr<int Function(int)>(good, "function")(42);
+  check = expr<Function>(good, "function as Function")(42);
+  check = expr<dynamic>(good, "function as dynamic")(42);
+
+  // These implicit `.call` invocations should work:
+
+  // Callable types.
+  check = expr<C>(C())(42);
+  check = expr<M>(MC())(42);
+  check = expr<E>(E.instance)(42);
+  check = expr<ET>(ET(null), "ET")(42);
+  check = expr<NSMC>(NSMC())(42); // NSM-forwarder as call method.
+  // Extension types inheriting those call methods.
+  check = expr<ETC>(C())(42);
+  check = expr<ETM>(MC())(42);
+  check = expr<ETE>(E.instance)(42);
+  check = expr<ETET>(ET(null), "ET")(42);
+  check = expr<ETNSMC>(NSMC())(42); // NSM-forwarder as call method.
+  // Callable extension methods.
+  check = expr<EC>(EC())(42);
+  check = expr<EM>(EMC())(42);
+  check = expr<EE>(EE.instance)(42);
+  check = expr<EET>(EET(null), "EET")(42);
+
+  // These implicit tear-offs of callable types should work.
+  tearoff = expr<C>(C());
+  tearoff = expr<M>(MC());
+  tearoff = expr<E>(E.instance);
+  tearoff = expr<ET>(ET(null), "ET");
+  tearoff = expr<NSMC>(NSMC()); // NSM-forwarder as call method.
+
+  // Dynamic invocations of callable (non-extension/extension-type types).
+  check = expr<dynamic>(C(), "C as dynamic")(42);
+  check = expr<dynamic>(MC(), "M as dynamic")(42);
+  check = expr<dynamic>(E.instance, "E as dynamic")(42);
+  check = expr<dynamic>(NSMC(), "NSMC as dynamic")(42);
+  // Dynamic invocation going to NSM with no forwarder, as method.
+  check = expr<dynamic>(NSMD(), "NSMD as dynamic")(42);
+  // Dynamic invocation going to NSM even if call getter, as method.
+  check = expr<dynamic>(BNSMC(), "BNSMC as dynamic")(42); // sdk#59952
+}
+
+String name = "";
+
+int good(int x) => x;
+int bad(int x) => 100 + x;
+
+T expr<T>([Object? value, String? typeName]) {
+  name = typeName ?? "$T";
+  return value as T;
+}
+
+void set check(int result) {
+  Expect.isTrue(result < 100, "$name.call(): WRONG: $result");
+}
+
+void set tearoff(int Function(int) to) {
+  var result = to(42);
+  Expect.isTrue(result < 100, "$name.call(): WRONG: $result");
+}
+
+class C {
+  int call(int x) => x;
+}
+
+mixin M {
+  int call(int x) => x;
+}
+class MC = Object with M;
+
+enum E {
+  instance;
+
+  int call(int x) => x;
+}
+
+extension type const ET(Object? _) {
+  int call(int x) => x;
+}
+
+class NSMC {
+  int call(int x);
+  Object? noSuchMethod(Invocation i) {
+    if (i.memberName == #call) {
+      if (i.isMethod) {
+        return i.positionalArguments.first;
+      } else if (i.isGetter) {
+        return bad;
+      }
+    }
+    return super.noSuchMethod(i);
+  }
+}
+
+// Inherited `call` methods on extension types.
+extension type ETC(C _) implements C {}
+extension type ETM(M _) implements M {}
+extension type ETE(E _) implements E {}
+extension type ETET(ET _) implements ET {}
+extension type ETNSMC(NSMC _) implements NSMC {}
+
+class NSMD {
+  const NSMD();
+  // No `call` member declared at all, can only be invoked dynamically.
+  noSuchMethod(i) {
+    if (i.memberName == #call) {
+      if (i.isMethod) {
+        return i.positionalArguments.first;
+      } else if (i.isGetter) {
+        return bad;
+      }
+    }
+    return super.noSuchMethod(i);
+  }
+}
+
+class EC {}
+
+extension on EC {
+  int call(int x) => 43;
+}
+
+enum EE {
+  instance;
+}
+
+extension on EE {
+  int call(int x) => 43;
+}
+
+mixin EM {}
+class EMC = Object with EM;
+
+extension on EM {
+  int call(int x) => 43;
+}
+
+extension type EET(Object? _) {}
+
+extension on EET {
+  int call(int x) => 43;
+}
+
+// "Bad" type, no `call` method, only a call getter.
+class BNSMC {
+  // Should be NSM-forwarder.
+  int Function(int) get call;
+  Object? noSuchMethod(Invocation i) {
+    if (i.memberName == #call) {
+      if (i.isMethod) {
+        return i.positionalArguments.first;
+      } else if (i.isGetter) {
+        return bad;
+      }
+    }
+    return super.noSuchMethod(i);
+  }
+}

Language/Expressions/Function_Invocation/Function_Expression_Invocation/call_A04_t02.dart

@@ -0,0 +1,59 @@
+// 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 A function expression invocation i has the form
+/// ef <A1, . . . , Ar>(a1, . . . , an, xn+1: an+1, . . . , xn+k: an+k),
+/// where ef is an expression.
+/// ...
+/// Let F be the static type of ef . If F is an interface type that has a method
+/// named call, i is treated as the ordinary invocation
+/// ef .call<A1, . . . , Ar>(a1, . . . , an, xn+1: an+1, . . . , xn+k: an+k)
+///
+/// @description Checks that it is a runtime error to implicitly invoke a
+/// `.call()` method on a type which has a `call` getter only.
+/// @author [email protected]
+/// @author lrhn
+/// @issue 59965
+
+// See https://github.com/dart-lang/sdk/issues/55803#issuecomment-2124182059
+
+import '../../../../Utils/expect.dart';
+
+void main() {
+  // These dynamic invocations should fail at runtime
+  // (dynamic invocation with `call` getter).
+  Expect.throws(() {
+    (BC() as dynamic)(42);
+  }, null, "BC as dynamic did not throw");
+  Expect.throws(() {
+    (BMC() as dynamic)(42);
+  }, null, "BM as dynamic did not throw");
+  Expect.throws(() {
+    (BE.instance as dynamic)(42);
+  }, null, "BE as dynamic did not throw");
+  Expect.throws(() {
+    (rec as dynamic)(42);
+  }, null, "Record as dynamic did not throw");
+}
+
+int foo(int x) => x;
+
+
+// "Bad" types, no `call` method, only a call getter.
+class BC {
+  int Function(int) get call => foo;
+}
+
+mixin BM {
+  int Function(int) get call => foo;
+}
+class BMC = Object with BM;
+
+enum BE {
+  instance;
+
+  int Function(int) get call => foo;
+}
+
+({int Function(int) call}) rec = (call: foo);

Language/Expressions/Function_Invocation/Function_Expression_Invocation/call_A04_t03.dart

@@ -0,0 +1,100 @@
+// 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 A function expression invocation i has the form
+/// ef <A1, . . . , Ar>(a1, . . . , an, xn+1: an+1, . . . , xn+k: an+k),
+/// where ef is an expression.
+/// ...
+/// Let F be the static type of ef . If F is an interface type that has a method
+/// named call, i is treated as the ordinary invocation
+/// ef .call<A1, . . . , Ar>(a1, . . . , an, xn+1: an+1, . . . , xn+k: an+k)
+///
+/// @description Checks that it is a compile-time error to invoke a `call()`
+/// method on a type which has an instance getter named `call`.
+/// @author [email protected]
+/// @author lrhn
+/// @issue 59963
+/// @issue 59964
+
+// See https://github.com/dart-lang/sdk/issues/55803#issuecomment-2124182059
+
+void main() {
+  // These should not compile, call is a getter.
+  // Instance getter.
+  expr<BC>(BC())(42);
+//^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  expr<BM>(BMC())(42);
+//^^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  expr<BE>(BE.instance)(42);
+//^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  expr<BET>(BET(null), "BET")(42); // sdk#59963
+//^^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  expr<BERT>(BERT(bad), "BERT")(42); // sdk#59963
+//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  expr<BNSMC>(BNSMC())(42);
+//^^^^^^^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  expr<NSMD>(NSMD())(42);
+//^^^^^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  expr<({int Function(int) call})>(rec, "record")(42); // sdk#59964
+//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}
+
+T expr<T>([Object? value, String? typeName]) {
+  return value as T;
+}
+
+int foo(int x) => x;
+
+({int Function(int) call}) rec = (call: foo);
+
+// "Bad" types, no `call` method, only a call getter.
+class BC {
+  int Function(int) get call => foo;
+}
+
+mixin BM {
+  int Function(int) get call => foo;
+}
+class BMC = Object with BM;
+
+enum BE {
+  instance;
+
+  int Function(int) get call => foo;
+}
+
+extension type BET(Null _) {
+  int Function(int) get call => foo;
+}
+
+// Representation type getter is a getter.
+extension type BERT(int Function(int) call) {}
+
+class BNSMC {
+  // Should be NSM-forwarder.
+  int Function(int) get call;
+  Object? noSuchMethod(Invocation i) => null;
+}
+
+class NSMD {
+  const NSMD();
+  // No `call` member declared at all, can only be invoked dynamically.
+  Object? noSuchMethod(i) => null;
+}