2015-09-29: use srfi-1

use srfi-1

diff --git a/tests/fast-sum.scm b/tests/fast-sum.scm
--- a/tests/fast-sum.scm
+++ b/tests/fast-sum.scm
@@ -1,3 +1,6 @@
+(use-modules (srfi srfi-1))
+
+
 (define-syntax fast-sum
   (syntax-rules (iota)
     ((fast-sum (iota count start))
diff --git a/tests/fast-sum.w b/tests/fast-sum.w
--- a/tests/fast-sum.w
+++ b/tests/fast-sum.w
@@ -1,3 +1,6 @@
+use-modules : srfi srfi-1
+
+
 define-syntax fast-sum
   syntax-rules : iota
     : fast-sum : iota count start