~ chicken-r7rs (master) 2337db7f32dbf18a2d8ee9ddc256a4b5503d8d86

commit 2337db7f32dbf18a2d8ee9ddc256a4b5503d8d86
Author:     Evan Hanson <evhan@foldling.org>
AuthorDate: Mon Jan 20 19:25:39 2014 +0000
Commit:     Evan Hanson <evhan@foldling.org>
CommitDate: Mon Jan 20 19:25:39 2014 +0000

    substring went missing, export it (again)

diff --git a/scheme.base-interface.scm b/scheme.base-interface.scm
index c6e9cab..89a95da 100644
--- a/scheme.base-interface.scm
+++ b/scheme.base-interface.scm
@@ -140,6 +140,7 @@
   string-ref string-set!
   string=? string<? string>? string<=? string>=?
   string?
+  substring
   symbol=?
   symbol?
   syntax-error