diff --git a/flap/src/hopix/hopixTypechecker.ml b/flap/src/hopix/hopixTypechecker.ml
index 31b7489..4d53376 100644
--- a/flap/src/hopix/hopixTypechecker.ml
+++ b/flap/src/hopix/hopixTypechecker.ml
@@ -81,7 +81,11 @@ and check_value_definition
   :  HopixTypes.typing_environment -> HopixAST.value_definition
   -> HopixTypes.typing_environment
   =
-  fun env def -> failwith "Students! This is your job! (check_value_definition)"
+  fun env -> function
+  | SimpleValue _ ->
+    failwith "Students! This is your job! (check_value_definition | SimpleValue)"
+  | RecFunctions _ ->
+    failwith "Students! This is your job! (check_value_definition | RecFunctions)"
 ;;
 
 let check_definition env = function