Fix type parameter element resolution for generics

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

Index: pkg/analyzer/lib/src/dart/element/element.dart
diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 00e4fe29416979e76a28113796c9584d70cbda65..71030e7353de0398bf8ff7855d85c9a24e1dabfb 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -2613,6 +2613,16 @@ class FunctionElementImpl extends ExecutableElementImpl
   void shareParameters(List<ParameterElement> parameters) {
     this._parameters = parameters;
   }
+
+  /**
+   * Set the type parameters defined by this type alias to the given
+   * [parameters] without becoming the parent of the parameters. This should
+   * only be used by the [TypeResolverVisitor] when creating a synthetic type
+   * alias.
+   */
+  void shareTypeParameters(List<TypeParameterElement> typeParameters) {
+    this._typeParameters = typeParameters;
+  }
 }
 
 /**