Don't perform incremental resolution if curly brackets are not balanced.

pkg/analyzer/test/generated/incremental_resolver_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.incremental_resolver_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 2771 matching lines @@
     _resolveUnit(r'''
 a() {}
 b() {}
 ''');
     _updateAndValidate(r'''
 a() {}
 bb() {}
 ''', expectedSuccess: false);
   }
 
+  void test_false_unbalancedCurlyBrackets_inNew() {
+    _resolveUnit(r'''
+class A {
+  aaa() {
+    if (true) {
+      1;
+    }
+  }
+
+  bbb() {
+    print(0123456789);
+  }
+}''');
+    _updateAndValidate(r'''
+class A {
+  aaa() {
+      1;
+    }
+  }
+
+  bbb() {
+    print(0123456789);
+  }
+}''', expectedSuccess: false);
+  }
+
+  void test_false_unbalancedCurlyBrackets_inOld() {
+    _resolveUnit(r'''
+class A {
+  aaa() {
+      1;
+    }
+  }
+
+  bbb() {
+    print(0123456789);
+  }
+}''');
+    _updateAndValidate(r'''
+class A {
+  aaa() {
+    if (true) {
+      1;
+    }
+  }
+
+  bbb() {
+    print(0123456789);
+  }
+}''', expectedSuccess: false);
+  }
+
   void test_fieldClassField_propagatedType() {
     _resolveUnit(r'''
 class A {
   static const A b = const B();
   const A();
 }
 
 class B extends A {
   const B();
 }
@@ skipping 539 matching lines @@
     // The existing CompilationUnitElement should be updated.
     expect(newUnit.element, same(oldUnitElement));
     // The only expected pending task should return the same resolved
     // "newUnit", so all clients will get it using the usual way.
     AnalysisResult analysisResult = analysisContext.performAnalysisTask();
     ChangeNotice notice = analysisResult.changeNotices[0];
     expect(notice.compilationUnit, same(newUnit));
     // Resolve "newCode" from scratch.
     if (compareWithFull) {
       _resetWithIncremental(false);
+      source = addSource(newCode + ' ');
       source = addSource(newCode);
       _runTasks();
       LibraryElement library = resolve(source);
       CompilationUnit fullNewUnit = resolveCompilationUnit(source, library);
+      // Validate tokens.
+      _assertEqualTokens(newUnit, fullNewUnit);
       // Validate that "incremental" and "full" units have the same resolution.
       try {
         assertSameResolution(newUnit, fullNewUnit, validateTypes: true);
       } on IncrementalResolutionMismatch catch (mismatch) {
         fail(mismatch.message);
       }
-      _assertEqualTokens(newUnit, fullNewUnit);
       List<AnalysisError> newFullErrors =
           analysisContext.getErrors(source).errors;
       _assertEqualErrors(newErrors, newFullErrors);
       // TODO(scheglov) check line info
     }
   }
 
   static void _assertEqualToken(Token incrToken, Token fullToken) {
+//    print('[${incrToken.offset}] |$incrToken| vs. [${fullToken.offset}] |$fullToken|');
     expect(incrToken.type, fullToken.type);
     expect(incrToken.offset, fullToken.offset);
     expect(incrToken.length, fullToken.length);
     expect(incrToken.lexeme, fullToken.lexeme);
   }
 
   static void _assertEqualTokens(CompilationUnit incrUnit,
       CompilationUnit fullUnit) {
     Token incrToken = incrUnit.beginToken;
     Token fullToken = fullUnit.beginToken;
@@ skipping 261 matching lines @@
   }
 }
 
 
 class _Edit {
   final int offset;
   final int length;
   final String replacement;
   _Edit(this.offset, this.length, this.replacement);
 }