Fix for summarization of generic function type aliases and support for resynthesizing.

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

Index: pkg/analyzer/lib/src/dart/element/handle.dart
diff --git a/pkg/analyzer/lib/src/dart/element/handle.dart b/pkg/analyzer/lib/src/dart/element/handle.dart
index e38f5fefd7bdb3862777918478edd54cf45f33ca..4b285cc9737f9cc5c20522fd465fe11b655d56ba 100644
--- a/pkg/analyzer/lib/src/dart/element/handle.dart
+++ b/pkg/analyzer/lib/src/dart/element/handle.dart
@@ -670,6 +670,45 @@ class FunctionTypeAliasElementHandle extends ElementHandle
 }
 
 /**
+ * A handle to a [GenericTypeAliasElement].
+ */
+class GenericTypeAliasElementHandle extends ElementHandle
+    implements GenericTypeAliasElement {
+  GenericTypeAliasElementHandle(
+      ElementResynthesizer resynthesizer, ElementLocation location)
+      : super(resynthesizer, location);
+
+  @override
+  GenericTypeAliasElement get actualElement =>
+      super.actualElement as GenericTypeAliasElement;
+
+  @override
+  CompilationUnitElement get enclosingElement =>
+      super.enclosingElement as CompilationUnitElement;
+
+  @override
+  GenericFunctionTypeElement get function => actualElement.function;
+
+  @override
+  ElementKind get kind => ElementKind.FUNCTION_TYPE_ALIAS;
+
+  @override
+  List<ParameterElement> get parameters => actualElement.parameters;
+
+  @override
+  DartType get returnType => actualElement.returnType;
+
+  @override
+  FunctionType get type => actualElement.type;
+
+  @override
+  List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
+
+  @override
+  FunctionTypeAlias computeNode() => actualElement.computeNode();
+}
+
+/**
  * A handle to an [ImportElement].
  */
 class ImportElementHandle extends ElementHandle implements ImportElement {