fix sorting of compilation unit members - related to #23947

pkg/analyzer/test/generated/parser_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library engine.parser_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ skipping 3320 matching lines @@
     NodeList<VariableDeclaration> vars =
         (fieldDecl as FieldDeclaration).fields.variables;
     expect(vars, hasLength(1));
     expect(vars[0].name.name, "v");
   }
 
   void test_functionExpression_named() {
     parseExpression("m(f() => 0);", [ParserErrorCode.EXPECTED_TOKEN]);
   }
 
+  void test_declarationBeforeDirective() {
+    CompilationUnit unit = ParserTestCase.parseCompilationUnit(
+        "class foo { } import 'bar.dart';",
+        [ParserErrorCode.DIRECTIVE_AFTER_DECLARATION]);
+    expect(unit.directives, hasLength(1));
+    expect(unit.declarations, hasLength(1));
+    ClassDeclaration classDecl = unit.childEntities.first;
+    expect(classDecl, isNotNull);
+    expect(classDecl.name.name, 'foo');
+  }
+
   void test_importDirectivePartial_as() {
     CompilationUnit unit = ParserTestCase.parseCompilationUnit(
         "import 'b.dart' d as b;", [ParserErrorCode.UNEXPECTED_TOKEN]);
     ImportDirective importDirective = unit.childEntities.first;
     expect(importDirective.asKeyword, isNotNull);
     expect(unit.directives, hasLength(1));
     expect(unit.declarations, hasLength(0));
   }
 
   void test_importDirectivePartial_hide() {
@@ skipping 7323 matching lines @@
         new Scanner(null, new CharSequenceReader(source), listener);
     Token tokenStream = scanner.tokenize();
     //
     // Parse the source.
     //
     Parser parser = new Parser(null, listener);
     return invokeParserMethodImpl(
         parser, methodName, <Object>[tokenStream], tokenStream) as Token;
   }
 }