From 25fe238af585ae5df3d563e6aa08afd1062c9a07 Mon Sep 17 00:00:00 2001
From: Chris Hanson <org/chris-hanson/cph>
Date: Thu, 30 Mar 2017 21:30:55 -0700
Subject: [PATCH] Fix bug: string output port must copy input strings.

---
 src/runtime/stringio.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/runtime/stringio.scm b/src/runtime/stringio.scm
index 98afab45d..27d00f90d 100644
--- a/src/runtime/stringio.scm
+++ b/src/runtime/stringio.scm
@@ -208,7 +208,7 @@ USA.
 (define (string-out/write-substring port string start end)
   (let ((os (textual-port-state port))
 	(n (fix:- end start)))
-    ((ostate-builder os) (string-slice string start end))
+    ((ostate-builder os) (string-copy string start end))
     (update-column-for-substring! os string start end)
     n))
 
-- 
2.25.1