--- a/langtools/src/share/classes/com/sun/tools/javac/tree/TreeInfo.java	Wed Apr 14 12:23:29 2010 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/tree/TreeInfo.java	Wed Apr 14 12:31:55 2010 +0100
@@ -204,6 +204,15 @@
         return (JCMethodInvocation)exec.expr;
     }
 
+    /** Return true if a tree represents a diamond new expr. */
+    public static boolean isDiamond(JCTree tree) {
+        switch(tree.getTag()) {
+            case JCTree.TYPEAPPLY: return ((JCTypeApply)tree).getTypeArguments().isEmpty();
+            case JCTree.NEWCLASS: return isDiamond(((JCNewClass)tree).clazz);
+            default: return false;
+        }
+    }
+
     /** Return true if a tree represents the null literal. */
     public static boolean isNull(JCTree tree) {
         if (tree.getTag() != JCTree.LITERAL)