diff --git a/done/Lib/Parser/Impl.newt b/done/Lib/Parser/Impl.newt
index 90f4132..7cbecee 100644
--- a/done/Lib/Parser/Impl.newt
+++ b/done/Lib/Parser/Impl.newt
@@ -84,7 +84,7 @@ getOps = P $ \ toks com ops col => OK ops toks com ops
 
 addOp : String -> Int -> Fixity -> Parser Unit
 addOp nm prec fix = P $ \ toks com ops col =>
-  let parts = split "_" nm in
+  let parts = split nm "_" in
   case parts of
     "" :: key :: rule => OK MkUnit toks com (updateMap key (MkOp nm prec fix False rule) ops)
     key :: rule => OK MkUnit toks com (updateMap key (MkOp nm prec fix True rule) ops)
diff --git a/done/Lib/Prettier.newt b/done/Lib/Prettier.newt
index 91c980d..469bed2 100644
--- a/done/Lib/Prettier.newt
+++ b/done/Lib/Prettier.newt
@@ -29,6 +29,14 @@ flatten Line = Text " "
 flatten (Text str) = Text str
 flatten (Alt x y) = flatten x
 
+noAlt : Doc -> Doc
+noAlt Empty = Empty
+noAlt (Seq x y) = Seq (noAlt x) (noAlt y)
+noAlt (Nest i x) = noAlt x
+noAlt Line = Line
+noAlt (Text str) = Text str
+noAlt (Alt x y) = noAlt x
+
 group : Doc -> Doc
 group x = Alt (flatten x) x
 
diff --git a/done/Main.newt b/done/Main.newt
index 3692c70..4f4116d 100644
--- a/done/Main.newt
+++ b/done/Main.newt
@@ -55,7 +55,7 @@ writeSource fn = do
         ( "\"use strict\";"
         ::  "const PiType = (h0, h1) => ({ tag: \"PiType\", h0, h1 })"
         :: Nil)
-        ++ map (render 90) docs
+        ++ map (render 90 ∘ noAlt) docs
   (Right _) <- liftIO {M} $ writeFile fn src
     | Left err => exitFailure (show err)
   -- (Right _) <- chmodRaw fn 493 | Left err => exitFailure (show err)
@@ -150,6 +150,19 @@ baseDir (dirs :< d) (ns :< n) = if d == n
   else Left "module path doesn't match directory"
 baseDir Lin _ = Left "module path doesn't match directory"
 
+showErrors : String -> String -> M Unit
+showErrors fn src = do
+  top <- get
+  (Nil) <- liftIO {M} $ readIORef top.errors
+    | errors => do
+        ignore $ for errors $ \err =>
+          putStrLn (showError src err)
+        -- if err.file == fn
+        -- then putStrLn (showError src err)
+        -- else putStrLn (showError "" err)
+        exitFailure "Compile failed"
+  pure MkUnit
+
 
 processFile : String -> M Unit
 processFile fn = do
@@ -180,7 +193,7 @@ processFile fn = do
   processDecl ("Prim" :: Nil) (PType emptyFC "Int" Nothing)
   processDecl ("Prim" :: Nil) (PType emptyFC "String" Nothing)
   processDecl ("Prim" :: Nil) (PType emptyFC "Char" Nothing)
-  let base = "port" -- FIXME
+  let base = "aoc2024" -- FIXME
   src <- processModule emptyFC base Nil (QN path modName')
   top <- get
   -- -- dumpContext top
@@ -190,6 +203,7 @@ processFile fn = do
   --     for_ errors $ \err =>
   --       putStrLn (showError src err)
   --     exitFailure "Compile failed"
+  showErrors fn src
   pure MkUnit
 
 
diff --git a/done/Node.newt b/done/Node.newt
index bb04eb6..e100881 100644
--- a/done/Node.newt
+++ b/done/Node.newt
@@ -30,5 +30,8 @@ pfunc writeFile uses (fs MkIORes MkUnit) : String → String → IO (Either Stri
 }`
 
 -- maybe System.exit or something, like the original putStrLn msg >> exitFailure
-pfunc exitFailure : ∀ a. String → a := `(_, msg) => { throw new Error(msg) }`
+pfunc exitFailure : ∀ a. String → a := `(_, msg) => { 
+  console.log(msg);
+  process.exit(1);
+}`
 
diff --git a/scripts/aoc2 b/scripts/aoc2
new file mode 100755
index 0000000..85adbec
--- /dev/null
+++ b/scripts/aoc2
@@ -0,0 +1,35 @@
+#!/bin/sh
+mkdir -p tmp
+echo "Test AoC 2024 solutions"
+NCC="bun run newt.js"
+total=0
+failed=0
+for fn in  aoc2024/Day*.newt; do
+  total=$((total + 1))
+  echo Test $fn
+  bn=$(basename $fn)
+  $NCC $fn -o out.js > tmp/${bn}.compile
+  if [ $? != "0" ]; then
+    echo Compile failed for $fn
+    failed=$((failed + 1))
+    continue
+  fi
+  # if there is a golden file, run the code and compare output
+  if [ -f ${fn}.golden ]; then
+    bun run out.js > tmp/${bn}.out
+    if [ $? != "0" ]; then
+      echo Run failed for $fn
+      failed=$((failed + 1))
+      continue
+    fi
+    if ! diff -q tmp/${bn}.out ${fn}.golden; then
+      echo "Output mismatch for $fn"
+      failed=$((failed + 1))
+    fi
+  fi
+done
+
+echo "Total tests: $total"
+echo "Failed tests: $failed"
+
+