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-rw-r--r--fast-expt.lisp2
1 files changed, 2 insertions, 0 deletions
diff --git a/fast-expt.lisp b/fast-expt.lisp
index 3318946..d3fb779 100644
--- a/fast-expt.lisp
+++ b/fast-expt.lisp
@@ -1,3 +1,5 @@
+(in-package "ACL2")
+
(defmacro square (x)
`(* ,x ,x))