Adds fixes for the 'super' keyword used by itself in certain situations

compiler/java/com/google/dart/compiler/parser/AbstractParser.java

Index: compiler/java/com/google/dart/compiler/parser/AbstractParser.java
diff --git a/compiler/java/com/google/dart/compiler/parser/AbstractParser.java b/compiler/java/com/google/dart/compiler/parser/AbstractParser.java
index 8889e15367dbeb82bcb8373f55e343d92c5310cf..759b19bb5b79b1fcfc2d2b2418a12eddedac43bb 100644
--- a/compiler/java/com/google/dart/compiler/parser/AbstractParser.java
+++ b/compiler/java/com/google/dart/compiler/parser/AbstractParser.java
@@ -6,6 +6,7 @@ package com.google.dart.compiler.parser;
 
 import com.google.dart.compiler.DartCompilationError;
 import com.google.dart.compiler.ErrorCode;
+import com.google.dart.compiler.parser.DartScanner.Location;
 
 /**
  * Abstract base class for sharing common utility methods between implementation
@@ -108,6 +109,23 @@ abstract class AbstractParser {
     lastErrorPosition = position.getPos();
     ctx.error(dartError);
   }
+  
+  /**
+   * Even though you pass a 'Position' to {@link #reportError} above, it only uses that to 
+   * prevent logging more than one error at that position.  This method actually uses the passed
+   * position to create the error event.
+   */
+  protected void reportErrorAtPosition(DartScanner.Position startPosition,
+                                       DartScanner.Position endPosition,
+                                       ErrorCode errorCode, Object... arguments) {
+    DartScanner.Location location = ctx.getTokenLocation();
+    if (location.getBegin().getPos() <= lastErrorPosition) {
+      return;
+    }
+    DartCompilationError dartError = new DartCompilationError(ctx.getSource(),
+        new Location(startPosition, endPosition), errorCode, arguments);
+    ctx.error(dartError);
+  }
 
   protected void reportUnexpectedToken(DartScanner.Position position, Token expected,
       Token actual) {