add type completions after "on" in a try block

pkg/analysis_server/test/services/completion/completion_test_util.dart

Index: pkg/analysis_server/test/services/completion/completion_test_util.dart
diff --git a/pkg/analysis_server/test/services/completion/completion_test_util.dart b/pkg/analysis_server/test/services/completion/completion_test_util.dart
index 8f9df5423e9eed5e3c4bc7017278c08f72159267..21da9dd15ad5f7302a743e73df4f7a29bc05d985 100644
--- a/pkg/analysis_server/test/services/completion/completion_test_util.dart
+++ b/pkg/analysis_server/test/services/completion/completion_test_util.dart
@@ -1545,6 +1545,33 @@ abstract class AbstractSelectorSuggestionTest extends AbstractCompletionTest {
     });
   }
 
+  test_CatchClause_onType() {
+    // TypeName  CatchClause  TryStatement
+    addTestSource('class A {a() {try{var x;} on ^ {}}}');
+    computeFast();
+    return computeFull((bool result) {
+      expect(request.replacementOffset, completionOffset);
+      expect(request.replacementLength, 0);
+      assertSuggestLocalClass('A');
+      assertSuggestImportedClass('Object');
+      assertNotSuggested('a');
+      assertNotSuggested('x');
+    });
+  }
+
+  test_CatchClause_onType_noBrackets() {
+    // TypeName  CatchClause  TryStatement
+    addTestSource('class A {a() {try{var x;} on ^}}');
+    computeFast();
+    return computeFull((bool result) {
+      expect(request.replacementOffset, completionOffset);
+      expect(request.replacementLength, 0);
+      assertSuggestLocalClass('A');
+      assertSuggestImportedClass('Object');
+      assertNotSuggested('x');
+    });
+  }
+
   test_CatchClause_typed() {
     // Block  CatchClause  TryStatement
     addTestSource('class A {a() {try{var x;} on E catch (e) {^}}}');