From d69313ce44a9415555033926c6a64b4120455502 Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jans.tuomi@gmail.com>
Date: Thu, 6 Oct 2022 10:04:14 +0300
Subject: Add "stack trace" output on error

---
 src/Utils.hs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/Utils.hs')

diff --git a/src/Utils.hs b/src/Utils.hs
index 8dd233f..ec8cfc8 100644
--- a/src/Utils.hs
+++ b/src/Utils.hs
@@ -201,6 +201,10 @@ throwL :: String -> String -> LContext a
 throwL p s = throwError $ LException mp s
     where mp = if p == "" then Nothing else Just p
 
+appendError :: String -> LException -> LContext a
+appendError as (LException psM es) =
+    throwError $ LException psM $ es ++ "\n  " ++ as
+
 asPairsM :: [a] -> LContext [(a, a)]
 asPairsM [] = return []
 asPairsM (a:b:rest) = do
-- 
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