1 files changed, 17 insertions, 0 deletions
diff --git a/tests/tailcall.lisp b/tests/tailcall.lisp
new file mode 100644
index 0000000..8cea496
--- /dev/null
+++ b/tests/tailcall.lisp
@@ -0,0 +1,17 @@
+(defun is-even (x)
+  (if (= x 0)
+    #t
+    (is-odd (- x 1))))
+
+(defun is-odd (x)
+    (is-even (- x 1)))
+
+(assert (is-even 10000))
+(assert (is-even 10))
+(assert (is-even 0))
+(assert (is-odd 1))
+(assert (is-even 2))
+
+;; can pass without stack overflow,
+;; but comment out for too time-consuming
+;; (assert (is-even 1000000))