Code completion improvement in the DAS- only suggest completions on the RHS of an as-expression tha…

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

Index: pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart
index 9edbe26b147558b50ca3ad974f450df5fed3192b..e617931231d0c1a055a40179739a39e2954f5f26 100644
--- a/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/local_reference_contributor_test.dart
@@ -331,7 +331,7 @@ void main() {expect(foo: ^)}''');
     assertNotSuggested('main');
   }
 
-  test_AsExpression() async {
+  test_AsExpression_type() async {
     // SimpleIdentifier  TypeName  AsExpression
     addTestSource('''
         class A {var b; X _c; foo() {var a; (a as ^).foo();}''');
@@ -346,6 +346,38 @@ void main() {expect(foo: ^)}''');
     assertNotSuggested('==');
   }
 
+  test_AsExpression_type_filter_extends() async {
+    // SimpleIdentifier  TypeName  AsExpression
+    addTestSource('''
+class A {} class B extends A {} class C extends A {} class D {}
+f(A a){ (a as ^) }''');
+    await computeSuggestions();
+
+    expect(replacementOffset, completionOffset);
+    expect(replacementLength, 0);
+    assertSuggestClass('B');
+    assertSuggestClass('C');
+    assertNotSuggested('A');
+    assertNotSuggested('D');
+    assertNotSuggested('Object');
+  }
+
+  test_IsExpression_type_filter_implements() async {
+    // SimpleIdentifier  TypeName  AsExpression
+    addTestSource('''
+class A {} class B implements A {} class C implements A {} class D {}
+f(A a){ (a as ^) }''');
+    await computeSuggestions();
+
+    expect(replacementOffset, completionOffset);
+    expect(replacementLength, 0);
+    assertSuggestClass('B');
+    assertSuggestClass('C');
+    assertNotSuggested('A');
+    assertNotSuggested('D');
+    assertNotSuggested('Object');
+  }
+
   test_AssignmentExpression_name() async {
     // SimpleIdentifier  VariableDeclaration  VariableDeclarationList
     // VariableDeclarationStatement  Block
@@ -2750,7 +2782,7 @@ main(){var a; if (a is Obj^)}''');
     assertNotSuggested('Object');
   }
 
-  test_IsExpression_type_subtype_extends_filter() async {
+  test_IsExpression_type_filter_extends() async {
     // SimpleIdentifier  TypeName  IsExpression  IfStatement
     addTestSource('''
 class A {} class B extends A {} class C extends A {} class D {}