Issue 5929. Ignore 'patch' before 'class'.

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

Index: compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java
diff --git a/compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java b/compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java
index bf007e6cb0342f67554db38a3672115889469143..4b96e97d9a03ff04a0aa7a9b8a8a218dd9a1c151 100644
--- a/compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java
+++ b/compiler/javatests/com/google/dart/compiler/parser/SyntaxTest.java
@@ -80,6 +80,13 @@ public class SyntaxTest extends AbstractParserTest {
         "  int as = 0;",
         "}"));
   }
+  
+  public void test_patch() {
+    DartUnit unit = parseUnit("patch.dart", Joiner.on("\n").join(
+        "patch class A {",
+        "}"));
+    assertEquals(1, unit.getTopLevelNodes().size());
+  }
 
   public void test_index_literalMap() {
     parseUnit("test.dart", Joiner.on('\n').join(