Better casting of for-in loops.

pkg/analyzer/test/generated/static_type_warning_code_test.dart

Index: pkg/analyzer/test/generated/static_type_warning_code_test.dart
diff --git a/pkg/analyzer/test/generated/static_type_warning_code_test.dart b/pkg/analyzer/test/generated/static_type_warning_code_test.dart
index ac762c4bf2dc334a0df4d5c96ca901fc199565c0..02993c54c813e26e65e2c5c4c92d88c4f4660fff 100644
--- a/pkg/analyzer/test/generated/static_type_warning_code_test.dart
+++ b/pkg/analyzer/test/generated/static_type_warning_code_test.dart
@@ -1917,6 +1917,26 @@ f() {
         [StaticTypeWarningCode.FOR_IN_OF_INVALID_TYPE]);
   }
 
+  void test_forIn_object() {
+    assertNoErrorsInCode(
+        '''
+f() {
+  Object o; // Could be [].
+  for (var i in o) {}
+}
+''');
+  }
+
+  void test_forIn_dynamic() {
+    assertNoErrorsInCode(
+        '''
+f() {
+  dynamic d; // Could be [].
+  for (var i in d) {}
+}
+''');
+  }
+
   void test_forIn_declaredVariableWrongType() {
     assertErrorsInCode(
         '''