diff --git a/mozilla/js/ref/jsemit.c b/mozilla/js/ref/jsemit.c
index 25a14b6a527..efa8c81c220 100644
--- a/mozilla/js/ref/jsemit.c
+++ b/mozilla/js/ref/jsemit.c
@@ -2436,7 +2436,6 @@ js_AllocTryNotes(JSContext *cx, JSCodeGenerator *cg)
     if (!cg->treeContext.tryCount)
 	return JS_TRUE;
 
-    PR_ASSERT(!cg->tryBase);
     size = (cg->treeContext.tryCount + 1) * sizeof(JSTryNote);
     PR_ARENA_ALLOCATE(cg->tryBase, &cx->tempPool, size);
     if (!cg->tryBase)
@@ -2451,7 +2450,7 @@ js_NewTryNote(JSContext *cx, JSCodeGenerator *cg, ptrdiff_t start,
 {
     JSTryNote *tn;
 
-    PR_ASSERT(cg->tryBase <= cg->tryNext && cg->tryNext < cg->tryLimit);
+    PR_ASSERT(cg->tryBase <= cg->tryNext);
     tn = cg->tryNext++;
     tn->start = start;
     tn->length = end - start;
diff --git a/mozilla/js/ref/jsemit.h b/mozilla/js/ref/jsemit.h
index 58527813603..14af7affec7 100644
--- a/mozilla/js/ref/jsemit.h
+++ b/mozilla/js/ref/jsemit.h
@@ -96,7 +96,6 @@ struct JSCodeGenerator {
     uintN           noteCount;      /* number of source notes so far */
     ptrdiff_t       lastNoteOffset; /* code offset for last source note */
     JSTryNote       *tryBase;       /* first exception handling note */
-    JSTryNote       *tryLimit;      /* pointer to one-past-end note */
     JSTryNote       *tryNext;       /* next available note */
 };
 
@@ -341,7 +340,7 @@ js_FinishTakingSrcNotes(JSContext *cx, JSCodeGenerator *cg);
 
 /*
  * Allocate cg->treeContext.tryCount notes (plus one for the end sentinel)
- * from cx->tempPool and set cg->tryBase/tryNext/tryLimit for exactly tryCount
+ * from cx->tempPool and set cg->tryBase/tryNext for exactly tryCount
  * js_NewTryNote calls.  The storage is freed by js_ResetCodeGenerator.
  */
 extern JSBool