From f89218c8b0bc899e84e39a75e0db85473a529b47 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Wed, 2 May 2018 08:27:19 +0200
Subject: [PATCH] fixes #7730, fixes #7746

---
 compiler/ropes.nim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/compiler/ropes.nim b/compiler/ropes.nim
index 89b92b76d..05d5e840c 100644
--- a/compiler/ropes.nim
+++ b/compiler/ropes.nim
@@ -188,11 +188,11 @@ iterator leaves*(r: Rope): string =
     var stack = @[r]
     while stack.len > 0:
       var it = stack.pop
-      while isNil(it.data):
+      while it.left != nil:
+        assert it.right != nil
         stack.add(it.right)
         it = it.left
         assert(it != nil)
-      assert(it.data != nil)
       yield it.data
 
 iterator items*(r: Rope): char =