Fix for issue 21771

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 01f5197e463414a08f7262967a789a5ad5d203d2..ba23d4b1bd619504f70892cdfe9d2be08220e57a 100644
--- a/pkg/analyzer/test/generated/resolver_test.dart
+++ b/pkg/analyzer/test/generated/resolver_test.dart
@@ -7041,6 +7041,19 @@ class B<E> {
     verify([source]);
   }
 
+  void test_unnecessaryCast_conditionalExpression() {
+    Source source = addSource(r'''
+abstract class I {}
+class A implements I {}
+class B implements I {}
+I m(A a, B b) {
+  return a == null ? b as I : a as I;
+}''');
+    resolve(source);
+    assertNoErrors(source);
+    verify([source]);
+  }
+
   void test_unnecessaryCast_dynamic_type() {
     Source source = addSource(r'''
 m(v) {