From 0a75e19cdae3c9fa329cc8c18f8284419a62432b Mon Sep 17 00:00:00 2001
From: pimjager <pim@pimjager.nl>
Date: Fri, 6 May 2016 12:02:07 +0200
Subject: [PATCH] Assignments are now typechecked

---
 examples/Markus/assignment_to_builtin.spl |  4 ++-
 examples/test.spl                         | 20 +++++----------
 sem.icl                                   | 30 ++++++-----------------
 3 files changed, 16 insertions(+), 38 deletions(-)

diff --git a/examples/Markus/assignment_to_builtin.spl b/examples/Markus/assignment_to_builtin.spl
index dc53a37..ca36030 100644
--- a/examples/Markus/assignment_to_builtin.spl
+++ b/examples/Markus/assignment_to_builtin.spl
@@ -9,5 +9,7 @@ f()
 {
   // This tries to assign to the built-in function isEmpty.
   // Adapt this line if your isEmpty is called differently.
-  isEmpty = blaat;
+  var isEmpty = blaat;
 }
+
+main() {return;}
diff --git a/examples/test.spl b/examples/test.spl
index b33297c..199cb26 100644
--- a/examples/test.spl
+++ b/examples/test.spl
@@ -1,15 +1,7 @@
-Bool n = True;
-
-test(x) :: Int -> Int {
-	var y = test(x+1);
-	return y;
-}
-
-f(n) :: Int -> Int{
-	var m = n+1;
-	return n;
-}
-
-test2(x) {
-	return f(x);
+test() {
+    var x = 5;
+    var y = 6;
+    x = x + y;
+    return y;
 }
+main() {return;}
\ No newline at end of file
diff --git a/sem.icl b/sem.icl
index 082cfe9..68b804d 100644
--- a/sem.icl
+++ b/sem.icl
@@ -270,10 +270,13 @@ instance infer Stmt where
         pure (compose s3 $ compose s2 s1, subst s3 wht)
 
     AssStmt (VarDef k fs) e =
-        infer e >>= \(s1, et)->
-        applySubst s1 >>|
-        changeGamma (extend k (Forall [] et)) >>| //todo: fieldselectors
-        pure (s1, VoidType)
+        lookup k >>= \expected ->
+        infer e >>= \(s1, given)->
+        lift (unify expected given) >>= \s2->
+        let s = compose s2 s1 in
+        applySubst s >>|
+        changeGamma (extend k (Forall [] given)) >>| //todo: fieldselectors
+        pure (s, VoidType)
 
     FunStmt f es = undef //what is this? 
 
@@ -345,25 +348,6 @@ instance type [a] | type a where
         applySubst (compose s2 s1) >>|
         pure (compose s2 s1, [v_:vs_])
 
-//        mapM processGamma dcls//
-
-////add the infered type in Gamma to AST constructs
-//class processGamma a :: a -> Typing a//
-
-//instance processGamma VarDecl where
-//    processGamma v=:(VarDecl p _ k e) = 
-//        gamma >>= \g -> case 'Map'.member k g of
-//            False = undef
-//            True  = instantiate ('Map'.find k g) >>= \t->
-//                    pure (VarDecl p (Just t) k e)//
-
-//instance processGamma FunDecl where
-//    processGamma v=:(FunDecl p k args _ vds stmts) = 
-//        gamma >>= \g -> case 'Map'.member k g of
-//            False = undef
-//            True  = instantiate ('Map'.find k g) >>= \t->
-//                    pure (FunDecl p k args (Just t) vds stmts) 
-
 introduce :: String -> Typing Type
 introduce k = 
     fresh >>= \tv ->
-- 
2.20.1