Substitute for type parameters in getReifiedType.

pkg/analyzer/test/src/dart/element/element_test.dart

Index: pkg/analyzer/test/src/dart/element/element_test.dart
diff --git a/pkg/analyzer/test/src/dart/element/element_test.dart b/pkg/analyzer/test/src/dart/element/element_test.dart
index 5c691e32c5e920c722fad008f15a6ce339eabdf9..52f73f619da8e95b064d12346eea115b63fdb840 100644
--- a/pkg/analyzer/test/src/dart/element/element_test.dart
+++ b/pkg/analyzer/test/src/dart/element/element_test.dart
@@ -40,6 +40,7 @@ main() {
     defineReflectiveTests(ElementImplTest);
     defineReflectiveTests(LibraryElementImplTest);
     defineReflectiveTests(MethodElementImplTest);
+    defineReflectiveTests(MethodMemberTest);
     defineReflectiveTests(MultiplyDefinedElementImplTest);
     defineReflectiveTests(ParameterElementImplTest);
     defineReflectiveTests(PropertyAccessorElementImplTest);
@@ -4014,6 +4015,49 @@ abstract class A {
 }
 
 @reflectiveTest
+class MethodMemberTest extends EngineTestCase {
+  /**
+   * The type provider used to access the types.
+   */
+  TestTypeProvider _typeProvider;
+
+  @override
+  void setUp() {
+    super.setUp();
+    _typeProvider = new TestTypeProvider();
+  }
+
+  void test_getReifiedType_substituteFor() {
+    AnalysisOptionsImpl options = new AnalysisOptionsImpl();
+    options.analyzeFunctionBodies = false;
+    AnalysisContextHelper contextHelper = new AnalysisContextHelper(options);
+    AnalysisContext context = contextHelper.context;
+    Source source = contextHelper.addSource(
+        "/test.dart",
+        r'''
+class A<T> {
+  T f(T x) => x;
+}
+class B<S> extends A<S> {
+  S f(S x) => x;
+}
+''');
+    // prepare CompilationUnitElement
+    LibraryElement libraryElement = context.computeLibraryElement(source);
+    CompilationUnitElement unitElement = libraryElement.definingCompilationUnit;
+    DartType objectType = _typeProvider.objectType;
+    // B.f
+    ClassElement elementB = unitElement.getType("B");
+    MethodElement BfElement = elementB.type
+        .lookUpInheritedMethod("f", library: libraryElement, thisType: true);
+    MethodElement AfElement = elementB.type
+        .lookUpInheritedMethod("f", library: libraryElement, thisType: false);
+    expect(BfElement.getReifiedType(objectType),
+        equals(AfElement.getReifiedType(objectType)));
+  }
+}
+
+@reflectiveTest
 class MultiplyDefinedElementImplTest extends EngineTestCase {
   void test_fromElements_conflicting() {
     TopLevelVariableElement firstElement =