Checking assignments

diff --git a/examples/StmtEx.spl b/examples/StmtEx.spl
index ef8cb88..192eca1 100644 (file)
--- a/examples/StmtEx.spl
+++ b/examples/StmtEx.spl
@@ -5,6 +5,7 @@ Int a = facR(4);
 //Int b = test(3);
 var f = beep();
 var n = True;
+var l = 1:2:[];
 
 facR(n) :: Int -> Int {
     test(3);
@@ -18,6 +19,10 @@ facR(n) :: Int -> Int {
 
 test(e) :: Int -> Bool {
     var i = 0;
+    i = 1;
+    l.tl = 4:[];
+    l.tl.hd = 3;
+    //l= 1:3:[]
     facR(z);
     while (e < 3) {
         return True;

diff --git a/sem.icl b/sem.icl
index 727fc1e..7af3b20 100644 (file)
--- a/sem.icl
+++ b/sem.icl
@@ -71,7 +71,10 @@ checkStmt t (IfStmt c st se) = unify BoolType c >>| mapM (checkStmt t) st
     >>= \st1-> mapM (checkStmt t) se >>= \se1-> pure (IfStmt c st1 se1)
 checkStmt t w=:(WhileStmt c et) = unify BoolType c >>| mapM (checkStmt t) et
     >>= \et1-> pure w
-checkStmt t (AssStmt (VarDef ident fs) e) = undef
+checkStmt t a=:(AssStmt (VarDef ident fs) e) = gets (\(st, r)->'Map'.get ident st)
+    >>= \mt->case mt of
+        Nothing = liftT $ Left $ UndeclaredVariableError zero ident
+        Just t = unify t fs >>= \t1 -> unify t1 e >>| pure a
 checkStmt t r=:(FunStmt (FunCall f es)) = typeFun f es >>| pure r
 checkStmt VoidType r=:(ReturnStmt Nothing) = pure r
 checkStmt t r=:(ReturnStmt (Just e)) = unify t e >>| pure r