1 files changed, 6 insertions, 2 deletions
diff --git a/factorial.mu b/factorial.mu
index 5b43d151..8a261207 100644
--- a/factorial.mu
+++ b/factorial.mu
@@ -10,8 +10,12 @@ def main [
 def factorial n:num -> result:num [
   local-scope
   load-ingredients
-  # if n=0 return 1
-  return-unless n, 1
+  {
+    # if n=0 return 1
+    zero?:bool <- equal n, 0
+    break-unless zero?
+    return 1
+  }
   # return n * factorial(n-1)
   x:num <- subtract n, 1
   subresult:num <- factorial x