--- old/test/sun/misc/FloatingDecimal/TestFDBigInteger.java	2013-06-21 11:49:37.000000000 -0700
+++ new/test/sun/misc/FloatingDecimal/TestFDBigInteger.java	2013-06-21 11:49:37.000000000 -0700
@@ -351,6 +351,10 @@
         if (!isImmutable && diff != left) {
             throw new Exception("leftInplaceSub of doesn't reuse its argument");
         }
+        if (isImmutable) {
+            check(biLeft, left, "leftInplaceSub corrupts its left immutable argument");
+        }
+        check(biRight, right, "leftInplaceSub corrupts its right argument");
         check(biLeft.subtract(biRight), diff, "leftInplaceSub returns wrong result");
     }
 
@@ -381,6 +385,10 @@
         if (!isImmutable && diff != right) {
             throw new Exception("rightInplaceSub of doesn't reuse its argument");
         }
+        check(biLeft, left, "leftInplaceSub corrupts its left argument");
+        if (isImmutable) {
+            check(biRight, right, "leftInplaceSub corrupts its right immutable argument");
+        }
         try {
             check(biLeft.subtract(biRight), diff, "rightInplaceSub returns wrong result");
         } catch (Exception e) {