From 0f420d3c45aa26b770bf2bda3588ffcc2ed574cf Mon Sep 17 00:00:00 2001
From: Mart Lubbers <mart@martlubbers.net>
Date: Wed, 13 Apr 2016 22:09:04 +0200
Subject: [PATCH] .

---
 examples/test.spl |  9 +++++++--
 sem.icl           | 12 +++++++++---
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/examples/test.spl b/examples/test.spl
index bdcb0ed..b33297c 100644
--- a/examples/test.spl
+++ b/examples/test.spl
@@ -1,10 +1,15 @@
 Bool n = True;
 
-test(x) {
-	return f(x);
+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);
+}
diff --git a/sem.icl b/sem.icl
index a041cee..b74ee76 100644
--- a/sem.icl
+++ b/sem.icl
@@ -54,15 +54,21 @@ semFunDecl fd=:(FunDecl p f args mt vds stmts) =
  	matchFunctions args ft >>= \tres->
     mapM semVarDecl vds >>= \newvds->
     mapM (checkStmt tres) stmts >>= \newstmts->
-	pure IntType >>= \returntype->
 	case mt of
-		Nothing = reconstructType args returntype 
-    		>>= \ftype->restoreGamma gamma 
+		Nothing = inferReturnType stmts
+			>>= \returntype->reconstructType args returntype 
+			>>= \ftype->restoreGamma gamma 
 			>>| putIdent f ftype >>| pure (
 			FunDecl p f args (Just ftype) newvds newstmts) 
 		Just t = restoreGamma gamma 
 			>>| pure (FunDecl p f args mt newvds newstmts) 
 
+inferReturnType :: [Stmt] -> Env Type
+inferReturnType [] = pure VoidType
+inferReturnType [ReturnStmt (Just t):rest] = typeExpr t
+inferReturnType [ReturnStmt _:rest] = pure VoidType
+inferReturnType [_:rest] = inferReturnType rest
+
 reconstructType :: [String] Type -> Env Type
 reconstructType [] t = pure t
 reconstructType [x:xs] t = gets (\(st, r)->'Map'.get x st)
-- 
2.20.1