From fa73f7e0d251020e47185a94699c41d9575f4052 Mon Sep 17 00:00:00 2001
From: pimjager <pim@pimjager.nl>
Date: Wed, 13 Apr 2016 11:49:06 +0200
Subject: [PATCH] Working on lists

---
 sem.icl | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/sem.icl b/sem.icl
index 992d660..ab7aa9c 100644
--- a/sem.icl
+++ b/sem.icl
@@ -121,21 +121,23 @@ instance unify Expr where
 	unify (IdType _) e = liftT $ Left $ ParseError (extrPos e)
 			"Expression cannot be an polymorf type."
     unify VarType e = typeExpr e
+    unify (IdType i) e = undef
     //we have to cheat to decorate the error, can be done nicer?
     unify t e = StateT $ \s0 -> let res = runStateT m s0 in case res of
         Left err = Left $ decErr e err
         Right t = Right t //note, t :: (Type, Gamma) 
     where m = typeExpr e >>= \tex-> unify t tex 
 
-
+replace :: String Type -> Env Void
+replace _ _ = undef
 
 instance unify Type where
 	unify IntType IntType = pure IntType
 	unify BoolType BoolType = pure BoolType
 	unify CharType CharType = pure CharType
-    //unify t (IdType i) = unify (IdType i) t
-    //note, don't use putIdent as that will call unify again
-    //unify (IdType i) e=:(IdType j) = modify (\(st, r)->('Map'.put j e st, r))
+    unify (IdType i) t=:(IdType j) = replace i t >>| pure t
+    unify t (IdType i) = unify (IdType i) t
+    unify (IdType i) t = replace i t >>| pure t
     //unify (ListType t1) (ListType t2) = unify t1 t2
 	unify t1 t2 = liftT $ Left $ UnifyError zero t1 t2
 
-- 
2.20.1