Fix fragile pattern-matching.

diff --git a/polymorphic-life/001/src/polymorphic_life.ml b/polymorphic-life/001/src/polymorphic_life.ml
index 7b55572..4a28992 100644 (file)
--- a/polymorphic-life/001/src/polymorphic_life.ml
+++ b/polymorphic-life/001/src/polymorphic_life.ml
@@ -97,7 +97,8 @@ module Conway : CELL = struct
     | A when live_neighbors < 4 -> A
     | A when live_neighbors > 3 -> D
     | D when live_neighbors = 3 -> A
-    | t -> t
+    | A -> A
+    | D -> D
 end