Hi, looking at `importsOnly`: #if MIN_VERSION_GLASGOW_HASKELL(8,8,1,0) pp <- liftIO $ preprocess sess file Nothing Nothing let (dflags, tmp) = case pp of Left _ -> error $ "preprocessing failed " <> show file Right success -> success #else Since 8.8.1 `preprocess` takes an addition argument of type `Maybe StringBuffer` that you're setting to `Nothing` here, so the pipeline will read your on-disk file instead of using the buffer. The whole point of that change was to allow passing in-memory buffers straight into the pipeline for tooling so I'm hoping you can use that to simplify your workarounds, see https://gitlab.haskell.org/ghc/ghc/merge_requests/1014/ for context. --Daniel On Wed, Feb 26, 2020 at 09:58:31PM +0000, Tseen She wrote:
Hi ghc-devs,
When upgrading my dev tool to use the 8.8.x api I have found that calls to lookupModule / findModule are failing on uncompilable code, whereas these calls succeeded on 8.4 and 8.6.
Unlike another question that I have asked [1] which seems related, I don't intend to do any typechecking here, I only want access to the ModuleInfo.
Has this been an intentional change? Is there a way to recover the original behaviour?
If I cannot get this to work then it means that a new feature introduced in https://gitlab.haskell.org/ghc/ghc/merge_requests/1541 that I was quite excited about is unusable :-(
[1] https://mail.haskell.org/pipermail/ghc-devs/2020-February/018655.html
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