Promote class to a reserved word

compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java

Index: compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
diff --git a/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java b/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
index 4f2eb83b2ad441c02ffbea50a378041469479120..01dc41be873ffabb0e657fd20991a006096064f0 100644
--- a/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
+++ b/compiler/javatests/com/google/dart/compiler/parser/NegativeParserTest.java
@@ -302,4 +302,15 @@ public class NegativeParserTest extends CompilerTestCase {
             "}"),
         dartUnit.toDietSource().trim());
   }
+
+  public void testReservedWordClass() {
+    parseExpectErrors(Joiner.on("\n").join(
+        "class foo {}",
+        "main() {",
+        "  int class = 10;",
+        "  print(\"class = $class\");",
+        "}"),
+        errEx(ParserErrorCode.EXPECTED_TOKEN, 3, 7, 5),
+        errEx(ParserErrorCode.UNEXPECTED_TOKEN, 4, 19, 5));
+  }
 }