From f85f5515486504c9c3401332269a0dda20c96f1d Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom.smeding@gmail.com>
Date: Sat, 23 May 2020 11:38:35 +0200
Subject: Also case-reduce in a case-scrutinised expression

---
 src/Haskell/Rewrite.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Haskell/Rewrite.hs b/src/Haskell/Rewrite.hs
index 301bdb4..7eaadea 100644
--- a/src/Haskell/Rewrite.hs
+++ b/src/Haskell/Rewrite.hs
@@ -44,7 +44,7 @@ etared e = recurse id etared e
 
 casered :: Bool -> Expr -> Expr
 casered ambig orig@(Case subj arms) =
-    case catMaybes [(,rhs) <$> unify p subj | (p, rhs) <- arms] of
+    case catMaybes [(,rhs) <$> unify p (casered ambig subj) | (p, rhs) <- arms] of
         [] -> recurse id (casered ambig) orig
         ((mp, rhs):rest) ->
             let res = foldl' (\e' (n, rhs') -> rewrite n rhs' e') rhs (Map.assocs mp)
-- 
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