warning about mu, some tweaks

[lambda.git] / exercises / assignment5.mdwn

diff --git a/exercises/assignment5.mdwn b/exercises/assignment5.mdwn
index 7388948..a74da85 100644 (file)
--- a/exercises/assignment5.mdwn
+++ b/exercises/assignment5.mdwn
@@ -329,7 +329,9 @@ any type `α`, as long as your function is of type `α -> α` and you have a bas
         -- Or this:
         let sysf_true = (\y n -> y) :: Sysf_bool a
 
-            :set -XExplicitForAll
+    Note that in both OCaml and Haskell code, the generalization `∀α` on the free type variable `α` is implicit. If you really want to, you can supply it explicitly in Haskell by saying:
+
+        :set -XExplicitForAll
         let { sysf_true :: forall a. Sysf_bool a; ... }
         -- or
         let { sysf_true :: forall a. a -> a -> a; ... }