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| author | Matthew Pickering <matthewtpickering@gmail.com> | 2021-03-29 15:00:56 +0100 |
|---|---|---|
| committer | Matthew Pickering <matthewtpickering@gmail.com> | 2021-04-07 09:38:49 +0100 |
| commit | 6d286cec8161396b56ee769bcee835c8eca0e181 (patch) | |
| tree | 62b933afcbddee7a8fd9208f4c536bd8000d096c | |
| parent | 5babf63a1574b11ba74227f990424b8fe856de1f (diff) | |
| download | haskell-6d286cec8161396b56ee769bcee835c8eca0e181.tar.gz | |
Make updTcRef force the result
This can lead to a classic thunk build-up in a TcRef
Fixes #19596
| -rw-r--r-- | compiler/GHC/Tc/Utils/Monad.hs | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/compiler/GHC/Tc/Utils/Monad.hs b/compiler/GHC/Tc/Utils/Monad.hs index bddb585a51..fb613c8f8d 100644 --- a/compiler/GHC/Tc/Utils/Monad.hs +++ b/compiler/GHC/Tc/Utils/Monad.hs @@ -695,8 +695,7 @@ writeTcRef = writeMutVar updTcRef :: TcRef a -> (a -> a) -> TcRnIf gbl lcl () -- Returns () -updTcRef ref fn = liftIO $ do { old <- readIORef ref - ; writeIORef ref (fn old) } +updTcRef ref fn = liftIO $ modifyIORef' ref fn {- ************************************************************************ |