Ignore synthetic tokens when search for AstNode.

pkg/analyzer/lib/src/generated/parser.dart

Index: pkg/analyzer/lib/src/generated/parser.dart
diff --git a/pkg/analyzer/lib/src/generated/parser.dart b/pkg/analyzer/lib/src/generated/parser.dart
index 89ae664659ed85cf014a7a85246176b1d40e72b3..e040afdd0ec0be797d96f04c3ec117a14ef59dc5 100644
--- a/pkg/analyzer/lib/src/generated/parser.dart
+++ b/pkg/analyzer/lib/src/generated/parser.dart
@@ -6581,8 +6581,7 @@ class Parser {
       _reportErrorForCurrentToken(ParserErrorCode.MISSING_STATEMENT);
       return new EmptyStatement(_createSyntheticToken(TokenType.SEMICOLON));
     } else {
-      return new ExpressionStatement(
-          parseExpression2(), _expect(TokenType.SEMICOLON));
+      return new ExpressionStatement(parseExpression2(), _expectSemicolon());
     }
   }