diff --git a/src/Main.hs b/src/Main.hs
index 7866484..649081e 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -12,6 +12,7 @@ import Windows12.Parser (programP)
 import System.Environment (getArgs)
 import LLVM.Pretty
 import Windows12.Ast
+import Windows12.Semant (convert)
 import Windows12.CodeGen (codegen)
 
 
@@ -26,4 +27,7 @@ main = do
       test <- T.readFile inputFile
       case parse programP inputFile test of
         Left err -> print err
-        Right ast -> TL.writeFile outputFile (ppllvm (codegen (cs inputFile) ast))
+        Right ast ->
+          case convert ast of
+            Left err -> putStrLn err
+            Right ast -> TL.writeFile outputFile (ppllvm (codegen (cs inputFile) ast))
diff --git a/src/Windows12/CodeGen.hs b/src/Windows12/CodeGen.hs
index 28c8175..498e10e 100644
--- a/src/Windows12/CodeGen.hs
+++ b/src/Windows12/CodeGen.hs
@@ -1,8 +1,8 @@
 module Windows12.CodeGen where
 
 import Data.Text (Text)
-import Windows12.Ast
+import Windows12.TAst
 import LLVM.AST (Module)
 
-codegen :: Text -> Program -> Module
-codegen filename (Program structs enums funcs) = undefined
+codegen :: Text -> TProgram -> Module
+codegen filename (TProgram structs enums funcs) = undefined