Expose function contained in GenericTypeAliasImpl.

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

Index: pkg/analyzer/lib/dart/element/element.dart
diff --git a/pkg/analyzer/lib/dart/element/element.dart b/pkg/analyzer/lib/dart/element/element.dart
index 853cf841bf15c5df5b7550d9e991143178935aec..b348a15d9f416dfd9b12ea05c4bc511bc4f4e25f 100644
--- a/pkg/analyzer/lib/dart/element/element.dart
+++ b/pkg/analyzer/lib/dart/element/element.dart
@@ -1329,10 +1329,26 @@ abstract class FunctionTypedElement implements TypeParameterizedElement {
 
 /**
  * The pseudo-declaration that defines a generic function type.
+ *
+ * Clients may not extend, implement, or mix-in this class.
  */
 abstract class GenericFunctionTypeElement implements FunctionTypedElement {}
 
 /**
+ * A [FunctionTypeAliasElement] whose returned function type has a [type]
+ * parameter.
+ *
+ * Clients may not extend, implement, or mix-in this class.
+ */
+abstract class GenericTypeAliasElement implements FunctionTypeAliasElement {
+  /**
+   * Return the generic function type element representing the generic function
+   * type on the right side of the equals.
+   */
+  GenericFunctionTypeElement get function;
+}
+
+/**
  * A combinator that causes some of the names in a namespace to be hidden when
  * being imported.
  *