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-rw-r--r--compiler/parser/Parser.y.pp1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/parser/Parser.y.pp b/compiler/parser/Parser.y.pp
index 5a181cf53c..5441299ff5 100644
--- a/compiler/parser/Parser.y.pp
+++ b/compiler/parser/Parser.y.pp
@@ -8,6 +8,7 @@
-- ---------------------------------------------------------------------------
{
+{-# LANGUAGE BangPatterns #-} -- required for versions of Happy before 1.18.6
{-# OPTIONS -Wwarn -w -XNoMonomorphismRestriction #-}
-- The NoMonomorphismRestriction deals with a Happy infelicity
-- With OutsideIn's more conservativ monomorphism restriction