Abstract over the type system.

pkg/analyzer/lib/src/generated/testing/element_factory.dart

Index: pkg/analyzer/lib/src/generated/testing/element_factory.dart
diff --git a/pkg/analyzer/lib/src/generated/testing/element_factory.dart b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
index 58d7bae2c7275ad360a8c668abc638df665143a6..9539d418fa8edb5f692e0c4095a031eb6250053c 100644
--- a/pkg/analyzer/lib/src/generated/testing/element_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
@@ -346,6 +346,40 @@ class ElementFactory {
       functionElement4(
           functionName, null, normalParameters, names, namedParameters);
 
+  static FunctionElementImpl functionElement8(
+      List<DartType> parameters, DartType returnType,
+      {List<DartType> optional, Map<String, DartType> named}) {
+    List<ParameterElement> parameterElements = new List<ParameterElement>();
+    for (int i = 0; i < parameters.length; i++) {
+      ParameterElementImpl parameterElement =
+          new ParameterElementImpl("a$i", i);
+      parameterElement.type = parameters[i];
+      parameterElement.parameterKind = ParameterKind.REQUIRED;
+      parameterElements.add(parameterElement);
+    }
+    if (optional != null) {
+      int j = parameters.length;
+      for (int i = 0; i < optional.length; i++) {
+        ParameterElementImpl parameterElement =
+            new ParameterElementImpl("o$i", j);
+        parameterElement.type = optional[i];
+        parameterElement.parameterKind = ParameterKind.POSITIONAL;
+        parameterElements.add(parameterElement);
+        j++;
+      }
+    } else if (named != null) {
+      int j = parameters.length;
+      for (String s in named.keys) {
+        ParameterElementImpl parameterElement = new ParameterElementImpl(s, j);
+        parameterElement.type = named[s];
+        parameterElement.parameterKind = ParameterKind.NAMED;
+        parameterElements.add(parameterElement);
+      }
+    }
+
+    return functionElementWithParameters("f", returnType, parameterElements);
+  }
+
   static FunctionElementImpl functionElementWithParameters(String functionName,
       DartType returnType, List<ParameterElement> parameters) {
     FunctionElementImpl functionElement =