Fix some corner cases of resynthesizing generic function types.

pkg/analyzer/lib/src/dart/element/type.dart

Index: pkg/analyzer/lib/src/dart/element/type.dart
diff --git a/pkg/analyzer/lib/src/dart/element/type.dart b/pkg/analyzer/lib/src/dart/element/type.dart
index 03c361d8fe1815d3686e0b962296c22ec350d5ef..9c357daca7c50e2f51c6fc26f60de4d2d79d81ed 100644
--- a/pkg/analyzer/lib/src/dart/element/type.dart
+++ b/pkg/analyzer/lib/src/dart/element/type.dart
@@ -200,9 +200,9 @@ class FunctionTypeImpl extends TypeImpl implements FunctionType {
    * Initialize a newly created function type to be declared by the given
    * [element], with the given [name] and [typeArguments].
    */
-  FunctionTypeImpl.elementWithNameAndArgs(
-      Element element, String name, List<DartType> typeArguments)
-      : this._(element, name, null, typeArguments, true);
+  FunctionTypeImpl.elementWithNameAndArgs(Element element, String name,
+      List<DartType> typeArguments, bool isInstantiated)
+      : this._(element, name, null, typeArguments, isInstantiated);
 
   /**
    * Initialize a newly created function type to be declared by the given
@@ -369,6 +369,11 @@ class FunctionTypeImpl extends TypeImpl implements FunctionType {
     return new List<DartType>.from(typeArguments.skip(skipCount));
   }
 
+  /**
+   * Return `true` if this type is the result of instantiating type parameters.
+   */
+  bool get isInstantiated => _isInstantiated;
+
   @override
   Map<String, DartType> get namedParameterTypes {
     LinkedHashMap<String, DartType> namedParameterTypes =