Support for using generic function types in other AST structures.

pkg/analyzer/test/generated/declaration_resolver_test.dart

 // Copyright (c) 2015, 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.
 
 library engine.declaration_resolver_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 450 matching lines @@
     CompilationUnit unit = await resolveSource(code);
     PropertyAccessorElement setterElement =
         _findSimpleIdentifier(unit, code, 'zzz(_)').staticElement;
     expect(setterElement.isSetter, isTrue);
     // re-resolve
     CompilationUnit unit2 = _cloneResolveUnit(unit);
     SimpleIdentifier getterName = _findSimpleIdentifier(unit2, code, 'zzz(_)');
     expect(getterName.staticElement, same(setterElement));
   }
 
+  test_genericFunction_asFunctionReturnType() async {
+    String code = r'''
+Function(int, String) f() => null;
+''';
+    CompilationUnit unit = await resolveSource(code);
+    // re-resolve
+    _cloneResolveUnit(unit);
+    // no other validations than built into DeclarationResolver
+  }
+
+  test_genericFunction_asGenericFunctionReturnType() async {
+    String code = r'''
+typedef F<T> = int Function(T t, S s) Function<S>(int);
+''';
+    CompilationUnit unit = await resolveSource(code);
+    // re-resolve
+    _cloneResolveUnit(unit);
+    // no other validations than built into DeclarationResolver
+  }
+
+  test_genericFunction_asMethodReturnType() async {
+    String code = r'''
+class C {
+  Function(int, String) m() => null;
+}
+''';
+    CompilationUnit unit = await resolveSource(code);
+    // re-resolve
+    _cloneResolveUnit(unit);
+    // no other validations than built into DeclarationResolver
+  }
+
+  test_genericFunction_asParameterReturnType() async {
+    String code = r'''
+f(Function(int, String) p) => null;
+''';
+    CompilationUnit unit = await resolveSource(code);
+    // re-resolve
+    _cloneResolveUnit(unit);
+    // no other validations than built into DeclarationResolver
+  }
+
+  test_genericFunction_asTopLevelVariableType() async {
+    String code = r'''
+int Function(int, String) v;
+''';
+    CompilationUnit unit = await resolveSource(code);
+    // re-resolve
+    _cloneResolveUnit(unit);
+    // no other validations than built into DeclarationResolver
+  }
+
   test_invalid_functionDeclaration_getter_inFunction() async {
     String code = r'''
 var v = (() {
   main() {
     int get zzz => 42;
   }
 });
 ''';
     CompilationUnit unit = await resolveSource(code);
     FunctionElement getterElement =
@@ skipping 259 matching lines @@
     expect(element.type.toString(), "<T>(T, T) → T");
     expect(t.element, same(tElement));
 
     // re-resolve
     CompilationUnit unit2 = _cloneResolveUnit(unit);
     node = _findSimpleIdentifier(unit2, code, 'max').parent;
     t = node.typeParameters.typeParameters[0];
     expect(t.element, same(tElement));
   }
 }