Fix another false positive for not used function type alias.

pkg/analyzer/test/generated/resolver_test.dart

Index: pkg/analyzer/test/generated/resolver_test.dart
diff --git a/pkg/analyzer/test/generated/resolver_test.dart b/pkg/analyzer/test/generated/resolver_test.dart
index f2160187f57cdb8535c45870c96b60b233ff4fb0..2f4663a0363bb57dd0a24743a1369f57062d719a 100644
--- a/pkg/analyzer/test/generated/resolver_test.dart
+++ b/pkg/analyzer/test/generated/resolver_test.dart
@@ -3337,6 +3337,19 @@ main() {
     verify([source]);
   }
 
+  void test_unusedElement_class_isUsed_typeArgument() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+class _A {}
+main() {
+  var v = new List<_A>();
+  print(v);
+}''');
+    resolve(source);
+    assertNoErrors(source);
+    verify([source]);
+  }
+
   void test_unusedElement_class_notUsed_inClassMember() {
     enableUnusedElement = true;
     Source source = addSource(r'''
@@ -3568,6 +3581,19 @@ main(_F f) {
     verify([source]);
   }
 
+  void test_unusedElement_functionTypeAlias_isUsed_typeArgument() {
+    enableUnusedElement = true;
+    Source source = addSource(r'''
+typedef _F(a, b);
+main() {
+  var v = new List<_F>();
+  print(v);
+}''');
+    resolve(source);
+    assertNoErrors(source);
+    verify([source]);
+  }
+
   void test_unusedElement_functionTypeAlias_isUsed_variableDeclaration() {
     enableUnusedElement = true;
     Source source = addSource(r'''