Do not annotate type parameters of instantiated function types.

pkg/analyzer/test/src/task/strong/front_end_inference_test.dart

Index: pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
diff --git a/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart b/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
index 71af9e9363334de48ff3975de979730630f03576..a8d2788fffebf53c13b6104cfeebfb01202b047f 100644
--- a/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
+++ b/pkg/analyzer/test/src/task/strong/front_end_inference_test.dart
@@ -244,7 +244,9 @@ class _InstrumentationValueForType extends fasta.InstrumentationValue {
 
   void _appendType(StringBuffer buffer, DartType type) {
     if (type is FunctionType) {
-      _appendTypeArguments(buffer, type.typeArguments);
+      if (type.typeFormals.isNotEmpty) {
+        _appendTypeArguments(buffer, type.typeArguments);
+      }
       _appendParameters(buffer, type.parameters);
       buffer.write(' -> ');
       _appendType(buffer, type.returnType);