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| -rw-r--r-- | compiler/GHC/Hs/Instances.hs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/compiler/GHC/Hs/Instances.hs b/compiler/GHC/Hs/Instances.hs index a5588f31d2..61cb81006b 100644 --- a/compiler/GHC/Hs/Instances.hs +++ b/compiler/GHC/Hs/Instances.hs @@ -5,6 +5,13 @@ {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE UndecidableInstances #-} {-# OPTIONS_GHC -fno-warn-orphans #-} + +-- This module contains exclusively Data instances, which are going to be slow +-- no matter what we do. Furthermore, they are incredibly slow to compile with +-- optimisation (see #9557). Consequently we compile this with -O0. +-- See #18254. +{-# OPTIONS_GHC -O0 #-} + module GHC.Hs.Instances where -- This module defines the Data instances for the hsSyn AST. |