Create a new element for generic function types

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

Index: pkg/analyzer/lib/src/dart/element/builder.dart
diff --git a/pkg/analyzer/lib/src/dart/element/builder.dart b/pkg/analyzer/lib/src/dart/element/builder.dart
index 7c74fdf8437110711c1d349198c07486e291fec6..9ce994929e7b300457e80089610e70fceb568bca 100644
--- a/pkg/analyzer/lib/src/dart/element/builder.dart
+++ b/pkg/analyzer/lib/src/dart/element/builder.dart
@@ -430,17 +430,13 @@ class ApiElementBuilder extends _BaseElementBuilder {
   Object visitGenericFunctionType(GenericFunctionType node) {
     ElementHolder holder = new ElementHolder();
     _visitChildren(holder, node);
-    FunctionElementImpl element =
-        new FunctionElementImpl.forOffset(node.beginToken.offset);
+    GenericFunctionTypeElementImpl element =
+        new GenericFunctionTypeElementImpl.forOffset(node.beginToken.offset);
     _setCodeRange(element, node);
     element.parameters = holder.parameters;
     element.typeParameters = holder.typeParameters;
     FunctionType type = new FunctionTypeImpl(element);
     element.type = type;
-    if (node.returnType == null) {
-      element.hasImplicitReturnType = true;
-    }
-    _currentHolder.addFunction(element);
     (node as GenericFunctionTypeImpl).type = type;
     holder.validate();
     return null;