From c0d61295ed3575cfea7d2a22d81bae93c6009308 Mon Sep 17 00:00:00 2001
From: "Kartik K. Agaram" <vc@akkartik.com>
Date: Mon, 25 Sep 2017 21:20:49 -0700
Subject: 4008

Allow list `push` operation to save result in a new list rather than
mutate the existing list.
---
 nqueens.mu | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

(limited to 'nqueens.mu')

diff --git a/nqueens.mu b/nqueens.mu
index 135668ab..e566e474 100644
--- a/nqueens.mu
+++ b/nqueens.mu
@@ -36,10 +36,9 @@ def nqueens n:num, queens:&:list:square -> result:num, queens:&:list:square [
     {
       curr-conflicts?:bool <- conflict? curr, queens
       break-if curr-conflicts?
-      queens <- push curr, queens
-      sub-result:num <- nqueens n, queens
+      new-queens:&:list:square <- push curr, queens
+      sub-result:num <- nqueens n, new-queens
       result <- add result, sub-result
-      queens <- rest queens
     }
     next-file <- add next-file, 1
     loop
-- 
cgit 1.4.1-2-gfad0