Better panic message, indicating that it's not the user's fault (#186)

haskell · Sep 20, 2024 · e375dd5 · e375dd5
1 parent eb90467
commit e375dd5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/data/HappyTemplate.hs b/lib/data/HappyTemplate.hs
@@ -251,7 +251,7 @@ happyFail explist i tk action sts stk =
 -- Internal happy errors:
 
 notHappyAtAll :: a
-notHappyAtAll = Prelude.error "Internal Happy error\n"
+notHappyAtAll = Prelude.error "Internal Happy parser panic. This is not supposed to happen! Please open a bug report at https://github.com/haskell/happy/issues.\n"
 
 -----------------------------------------------------------------------------
 -- Hack to get the typechecker to accept our action functions