fix #25425, more inference of generic methods

pkg/analyzer/test/generated/resolver_test.dart

 // Copyright (c) 2014, 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 analyzer.test.generated.resolver_test;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 13016 matching lines @@
     check("f2", _isListOf(_isInt));
     check("f3", _isListOf(_isListOf(_isInt)));
   }
 }
 
 /**
  * Strong mode static analyzer end to end tests
  */
 @reflectiveTest
 class StrongModeStaticTypeAnalyzer2Test extends _StaticTypeAnalyzer2TestShared {
-  void test_genericMethod_functionExpressionInvocation_explicit() {
-    _resolveTestUnit(r'''
-class C<E> {
-  /*=T*/ f/*<T>*/(/*=T*/ e) => null;
-  static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
-  static final h = g;
-}
-
-/*=T*/ topF/*<T>*/(/*=T*/ e) => null;
-var topG = topF;
-void test/*<S>*/(/*=T*/ pf/*<T>*/(/*=T*/ e)) {
-  var c = new C<int>();
-  /*=T*/ lf/*<T>*/(/*=T*/ e) => null;
-
-  var lambdaCall = (/*<E>*/(/*=E*/ e) => e)/*<int>*/(3);
-  var methodCall = (c.f)/*<int>*/(3);
-  var staticCall = (C.g)/*<int>*/(3);
-  var staticFieldCall = (C.h)/*<int>*/(3);
-  var topFunCall = (topF)/*<int>*/(3);
-  var topFieldCall = (topG)/*<int>*/(3);
-  var localCall = (lf)/*<int>*/(3);
-  var paramCall = (pf)/*<int>*/(3);
-}
-''');
-    expect(_findIdentifier('methodCall').staticType.toString(), "int");
-    expect(_findIdentifier('staticCall').staticType.toString(), "int");
-    expect(_findIdentifier('staticFieldCall').staticType.toString(), "int");
-    expect(_findIdentifier('topFunCall').staticType.toString(), "int");
-    expect(_findIdentifier('topFieldCall').staticType.toString(), "int");
-    expect(_findIdentifier('localCall').staticType.toString(), "int");
-    expect(_findIdentifier('paramCall').staticType.toString(), "int");
-    expect(_findIdentifier('lambdaCall').staticType.toString(), "int");
-  }
-
-  void fail_genericMethod_functionExpressionInvocation_inferred() {
-    _resolveTestUnit(r'''
-class C<E> {
-  /*=T*/ f/*<T>*/(/*=T*/ e) => null;
-  static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
-  static final h = g;
-}
-
-/*=T*/ topF/*<T>*/(/*=T*/ e) => null;
-var topG = topF;
-void test/*<S>*/(/*=T*/ pf/*<T>*/(/*=T*/ e)) {
-  var c = new C<int>();
-  /*=T*/ lf/*<T>*/(/*=T*/ e) => null;
-
-  var lambdaCall = (/*<E>*/(/*=E*/ e) => e)(3);
-  var methodCall = (c.f)(3);
-  var staticCall = (C.g)(3);
-  var staticFieldCall = (C.h)(3);
-  var topFunCall = (topF)(3);
-  var topFieldCall = (topG)(3);
-  var localCall = (lf)(3);
-  var paramCall = (pf)(3);
-}
-''');
-    expect(_findIdentifier('methodCall').staticType.toString(), "int");
-    expect(_findIdentifier('staticCall').staticType.toString(), "int");
-    expect(_findIdentifier('staticFieldCall').staticType.toString(), "int");
-    expect(_findIdentifier('topFunCall').staticType.toString(), "int");
-    expect(_findIdentifier('topFieldCall').staticType.toString(), "int");
-    expect(_findIdentifier('localCall').staticType.toString(), "int");
-    expect(_findIdentifier('paramCall').staticType.toString(), "int");
-    expect(_findIdentifier('lambdaCall').staticType.toString(), "int");
-  }
-
-  void fail_genericMethod_functionInvocation_inferred() {
-    _resolveTestUnit(r'''
-class C<E> {
-  /*=T*/ f/*<T>*/(/*=T*/ e) => null;
-  static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
-  static final h = g;
-}
-
-/*=T*/ topF/*<T>*/(/*=T*/ e) => null;
-var topG = topF;
-void test/*<S>*/(/*=T*/ pf/*<T>*/(/*=T*/ e)) {
-  var c = new C<int>();
-  /*=T*/ lf/*<T>*/(/*=T*/ e) => null;
-  var methodCall = c.f(3);
-  var staticCall = C.g(3);
-  var staticFieldCall = C.h(3);
-  var topFunCall = topF(3);
-  var topFieldCall = topG(3);
-  var localCall = lf(3);
-  var paramCall = pf(3);
-}
-''');
-    expect(_findIdentifier('methodCall').staticType.toString(), "int");
-    expect(_findIdentifier('staticCall').staticType.toString(), "int");
-    expect(_findIdentifier('staticFieldCall').staticType.toString(), "int");
-    expect(_findIdentifier('topFunCall').staticType.toString(), "int");
-    expect(_findIdentifier('topFieldCall').staticType.toString(), "int");
-    expect(_findIdentifier('localCall').staticType.toString(), "int");
-    expect(_findIdentifier('paramCall').staticType.toString(), "int");
-  }
-
   void fail_genericMethod_tearoff_instantiated() {
     _resolveTestUnit(r'''
 class C<E> {
   /*=T*/ f/*<T>*/(E e) => null;
   static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
   static final h = g;
 }
 
 /*=T*/ topF/*<T>*/(/*=T*/ e) => null;
 var topG = topF;
@@ skipping 235 matching lines @@
     MethodInvocation f = _findIdentifier('f/*<int>*/').parent;
     FunctionType ft = f.staticInvokeType;
     expect(ft.toString(), '(String) → List<int>');
     expect('${ft.typeArguments}/${ft.typeParameters}', '[String, int]/[E, T]');
 
     SimpleIdentifier x = _findIdentifier('x');
     expect(x.staticType,
         typeProvider.listType.substitute4([typeProvider.intType]));
   }
 
+  void test_genericMethod_functionExpressionInvocation_explicit() {
+    _resolveTestUnit(r'''
+class C<E> {
+  /*=T*/ f/*<T>*/(/*=T*/ e) => null;
+  static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
+  static final h = g;
+}
+
+/*=T*/ topF/*<T>*/(/*=T*/ e) => null;
+var topG = topF;
+void test/*<S>*/(/*=T*/ pf/*<T>*/(/*=T*/ e)) {
+  var c = new C<int>();
+  /*=T*/ lf/*<T>*/(/*=T*/ e) => null;
+
+  var lambdaCall = (/*<E>*/(/*=E*/ e) => e)/*<int>*/(3);
+  var methodCall = (c.f)/*<int>*/(3);
+  var staticCall = (C.g)/*<int>*/(3);
+  var staticFieldCall = (C.h)/*<int>*/(3);
+  var topFunCall = (topF)/*<int>*/(3);
+  var topFieldCall = (topG)/*<int>*/(3);
+  var localCall = (lf)/*<int>*/(3);
+  var paramCall = (pf)/*<int>*/(3);
+}
+''');
+    expect(_findIdentifier('methodCall').staticType.toString(), "int");
+    expect(_findIdentifier('staticCall').staticType.toString(), "int");
+    expect(_findIdentifier('staticFieldCall').staticType.toString(), "int");
+    expect(_findIdentifier('topFunCall').staticType.toString(), "int");
+    expect(_findIdentifier('topFieldCall').staticType.toString(), "int");
+    expect(_findIdentifier('localCall').staticType.toString(), "int");
+    expect(_findIdentifier('paramCall').staticType.toString(), "int");
+    expect(_findIdentifier('lambdaCall').staticType.toString(), "int");
+  }
+
+  void test_genericMethod_functionExpressionInvocation_inferred() {
+    _resolveTestUnit(r'''
+class C<E> {
+  /*=T*/ f/*<T>*/(/*=T*/ e) => null;
+  static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
+  static final h = g;
+}
+
+/*=T*/ topF/*<T>*/(/*=T*/ e) => null;
+var topG = topF;
+void test/*<S>*/(/*=T*/ pf/*<T>*/(/*=T*/ e)) {
+  var c = new C<int>();
+  /*=T*/ lf/*<T>*/(/*=T*/ e) => null;
+
+  var lambdaCall = (/*<E>*/(/*=E*/ e) => e)(3);
+  var methodCall = (c.f)(3);
+  var staticCall = (C.g)(3);
+  var staticFieldCall = (C.h)(3);
+  var topFunCall = (topF)(3);
+  var topFieldCall = (topG)(3);
+  var localCall = (lf)(3);
+  var paramCall = (pf)(3);
+}
+''');
+    expect(_findIdentifier('methodCall').staticType.toString(), "int");
+    expect(_findIdentifier('staticCall').staticType.toString(), "int");
+    expect(_findIdentifier('staticFieldCall').staticType.toString(), "int");
+    expect(_findIdentifier('topFunCall').staticType.toString(), "int");
+    expect(_findIdentifier('topFieldCall').staticType.toString(), "int");
+    expect(_findIdentifier('localCall').staticType.toString(), "int");
+    expect(_findIdentifier('paramCall').staticType.toString(), "int");
+    expect(_findIdentifier('lambdaCall').staticType.toString(), "int");
+  }
+
   void test_genericMethod_functionInvocation_explicit() {
     _resolveTestUnit(r'''
 class C<E> {
   /*=T*/ f/*<T>*/(/*=T*/ e) => null;
   static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
   static final h = g;
 }
 
 /*=T*/ topF/*<T>*/(/*=T*/ e) => null;
 var topG = topF;
@@ skipping 11 matching lines @@
 ''');
     expect(_findIdentifier('methodCall').staticType.toString(), "int");
     expect(_findIdentifier('staticCall').staticType.toString(), "int");
     expect(_findIdentifier('staticFieldCall').staticType.toString(), "int");
     expect(_findIdentifier('topFunCall').staticType.toString(), "int");
     expect(_findIdentifier('topFieldCall').staticType.toString(), "int");
     expect(_findIdentifier('localCall').staticType.toString(), "int");
     expect(_findIdentifier('paramCall').staticType.toString(), "int");
   }
 
+  void test_genericMethod_functionInvocation_inferred() {
+    _resolveTestUnit(r'''
+class C<E> {
+  /*=T*/ f/*<T>*/(/*=T*/ e) => null;
+  static /*=T*/ g/*<T>*/(/*=T*/ e) => null;
+  static final h = g;
+}
+
+/*=T*/ topF/*<T>*/(/*=T*/ e) => null;
+var topG = topF;
+void test/*<S>*/(/*=T*/ pf/*<T>*/(/*=T*/ e)) {
+  var c = new C<int>();
+  /*=T*/ lf/*<T>*/(/*=T*/ e) => null;
+  var methodCall = c.f(3);
+  var staticCall = C.g(3);
+  var staticFieldCall = C.h(3);
+  var topFunCall = topF(3);
+  var topFieldCall = topG(3);
+  var localCall = lf(3);
+  var paramCall = pf(3);
+}
+''');
+    expect(_findIdentifier('methodCall').staticType.toString(), "int");
+    expect(_findIdentifier('staticCall').staticType.toString(), "int");
+    expect(_findIdentifier('staticFieldCall').staticType.toString(), "int");
+    expect(_findIdentifier('topFunCall').staticType.toString(), "int");
+    expect(_findIdentifier('topFieldCall').staticType.toString(), "int");
+    expect(_findIdentifier('localCall').staticType.toString(), "int");
+    expect(_findIdentifier('paramCall').staticType.toString(), "int");
+  }
+
   void test_genericMethod_functionTypedParameter() {
     _resolveTestUnit(r'''
 class C<E> {
   List/*<T>*/ f/*<T>*/(/*=T*/ f(E e)) => null;
 }
 main() {
   C<String> cOfString;
 }
 ''');
     SimpleIdentifier f = _findIdentifier('f');
@@ skipping 21 matching lines @@
 }
 void foo() {
   List list = null;
   list.map((e) => e);
   list.map((e) => 3);
 }''');
 
     SimpleIdentifier map1 = _findIdentifier('map((e) => e);');
     MethodInvocation m1 = map1.parent;
     expect(m1.staticInvokeType.toString(), '((dynamic) → dynamic) → dynamic');
-    expect(map1.staticType, isNull);
+    expect(map1.staticType.toString(), '<T>((dynamic) → T) → T');
     expect(map1.propagatedType, isNull);
     SimpleIdentifier map2 = _findIdentifier('map((e) => 3);');
     MethodInvocation m2 = map2.parent;
     expect(m2.staticInvokeType.toString(), '((dynamic) → int) → int');
-    expect(map2.staticType, isNull);
+    expect(map2.staticType.toString(), '<T>((dynamic) → T) → T');
     expect(map2.propagatedType, isNull);
   }
 
   void test_genericMethod_nestedCapture() {
     _resolveTestUnit(r'''
 class C<T> {
   /*=T*/ f/*<S>*/(/*=S*/ x) {
     new C<S>().f/*<int>*/(3);
     new C<S>().f; // tear-off
     return null;
@@ skipping 2265 matching lines @@
 library helper;
 dynamic $name = (int x) => x + 42');
 ''');
     String code = '''
 import 'helper.dart' as helper;
 main() {
   helper.$name(); // marker
 }''';
     SimpleIdentifier methodName = _findMarkedIdentifier(code, "(); // marker");
     MethodInvocation methodInvoke = methodName.parent;
-    expect(methodName.staticType, null, reason: 'library prefix has no type');
+    expect(methodName.staticType, typeProvider.dynamicType);
     expect(methodInvoke.staticType, typeProvider.dynamicType);
   }
 
   void test_objectMethodInference_disabled_for_local_function() {
     String name = 'toString';
     String code = '''
 main() {
   dynamic $name = () => null;
   $name(); // marker
 }''';
@@ skipping 925 matching lines @@
 
   void _resolveTestUnit(String code) {
     testCode = code;
     testSource = addSource(testCode);
     LibraryElement library = resolve2(testSource);
     assertNoErrors(testSource);
     verify([testSource]);
     testUnit = resolveCompilationUnit(testSource, library);
   }
 }