1 files changed, 7 insertions, 4 deletions
diff --git a/DSL/Interpretation.hs b/DSL/Interpretation.hs
index e68b64f..37165c3 100644
--- a/DSL/Interpretation.hs
+++ b/DSL/Interpretation.hs
@@ -1,5 +1,6 @@
 module DSL.Interpretation where
 
+import qualified Data.Map.Strict as M
 import Data.Foldable (foldlM)
 
 import DSL.Types
@@ -8,7 +9,7 @@ import DSL.Intrinsics
 import DSL.StdLib (stdlib)
 
 newMachine :: Machine
-newMachine = Machine { ok=True, stack=[], pTable=[] }
+newMachine = Machine { ok=True, stack=[], pTable=M.empty }
 
 pushData :: Machine -> StackData -> Machine
 pushData m@Machine{ stack=xs } x = m{ stack=x:xs }
@@ -47,7 +48,7 @@ applyIntrinsic i m = do
 
 applyCall :: ProcName -> Machine -> IO Machine
 applyCall _ m@Machine{ ok=False } = return m
-applyCall name m@Machine{ pTable=t } = case lookup name t of
+applyCall name m@Machine{ pTable=t } = case M.lookup name t of
   Nothing -> hcf m $ "PROCCALL: undefined proc: " ++ name
   Just bs -> evalBlocks bs m
 
@@ -92,6 +93,8 @@ evalBlocks (BLinear b:bs) m        = applyLinear m b >>= evalBlocks bs
 evalBlocks (BIf c t f:bs) m        = applyIf c t f m >>= evalBlocks bs
 evalBlocks (BWhile c b:bs) m       = applyWhile c b m >>= evalBlocks bs
 
-interpret :: ([ProcSpec], Program) -> IO ()
-interpret (t, p) = evalBlocks p newMachine{ pTable=stdlib++t } >> return ()
+interpret :: (ProcTable, Program) -> IO ()
+interpret (t, p) = case mergeProcTables stdlib t of
+  Just t' -> () <$ evalBlocks p newMachine{ pTable=t' }
+  Nothing -> putStrLn "Failed to include stdlib, duplicate proc definition?"