Issue 28027. Move Null to the bottom in the Analyzer.

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 4290c02d337a7bc50ea1b38f18736007d52b4570..1825c3cc039f672767d3c7652e65fc8c09f88a5f 100644
--- a/pkg/analyzer/test/generated/static_type_warning_code_test.dart
+++ b/pkg/analyzer/test/generated/static_type_warning_code_test.dart
@@ -1066,17 +1066,6 @@ f(B<A> b) {}''',
         [StaticTypeWarningCode.NON_TYPE_AS_TYPE_ARGUMENT]);
   }
 
-  test_returnOfInvalidType_async_future_int_mismatches_future_null() async {
-    await assertErrorsInCode(
-        '''
-import 'dart:async';
-Future<Null> f() async {
-  return 5;
-}
-''',
-        [StaticTypeWarningCode.RETURN_OF_INVALID_TYPE]);
-  }
-
   test_returnOfInvalidType_async_future_int_mismatches_future_string() async {
     await assertErrorsInCode(
         '''
@@ -1928,6 +1917,19 @@ f(Object o) {
         [StaticTypeWarningCode.UNDEFINED_METHOD]);
   }
 
+  test_undefinedMethod_ofNull() async {
+    // TODO(scheglov) Track https://github.com/dart-lang/sdk/issues/28430 to
+    // decide whether a warning should be reported here.
+    await assertErrorsInCode(
+        r'''
+Null f(int x) => null;
+main() {
+  f(42).abs();
+}
+''',
+        [StaticTypeWarningCode.UNDEFINED_METHOD]);
+  }
+
   test_undefinedMethod_private() async {
     addNamedSource(
         "/lib.dart",