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| -rw-r--r-- | compiler/GHC/Core/TyCon/RecWalk.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/GHC/Core/TyCon/RecWalk.hs b/compiler/GHC/Core/TyCon/RecWalk.hs index a472cf65bb..95363393a2 100644 --- a/compiler/GHC/Core/TyCon/RecWalk.hs +++ b/compiler/GHC/Core/TyCon/RecWalk.hs @@ -20,6 +20,7 @@ import GHC.Prelude import GHC.Core.TyCon import GHC.Core.TyCon.Env +import GHC.Utils.Outputable {- ************************************************************************ @@ -72,6 +73,9 @@ data RecTcChecker = RC !Int (TyConEnv Int) -- The upper bound, and the number of times -- we have encountered each TyCon +instance Outputable RecTcChecker where + ppr (RC n env) = text "RC:" <> int n <+> ppr env + -- | Initialise a 'RecTcChecker' with 'defaultRecTcMaxBound'. initRecTc :: RecTcChecker initRecTc = RC defaultRecTcMaxBound emptyTyConEnv |