PUBLIC Should I? OK, I just tried calling `flushFinderCaches` after I change the home unit to `mainUnitId`, but I still get exactly the same behaviour: `findInstalledHomeModule` returns `InstalledFound` and things go downhill from there. -----Original Message----- From: Matthew Pickering Sent: Tuesday, June 29, 2021 6:34 PM To: Erdi, Gergo Cc: ghc-devs@haskell.org Subject: [External] Re: Loading a typechecked module and then using it immediately as a package ATTENTION: This email came from an external source. Do not open attachments or click on links from unknown senders or unexpected emails. Always report suspicious emails using the Report As Phishing button in Outlook to protect the Bank and our clients. Are you clearing the FinderCache? On Tue, Jun 29, 2021 at 11:14 AM Erdi, Gergo wrote:

PUBLIC

I don't know yet what's going on, but one thing I did notice is that `findInstalledHomeModule` returns `InstalledFound` for `MyLib`, which doesn't sound right to me -- `MyLib` should come from the "fake-uid" unit, and `Test` is typechecked in the `mainUnitId`.

-----Original Message----- From: Erdi, Gergo Sent: Tuesday, June 29, 2021 5:51 PM To: Matthew Pickering Subject: Re: Loading a typechecked module and then using it immediately as a package

PUBLIC

I tried moving `MyLib.hs` into a directory different than `Test.sh`, but the error message still refers to its correct location! So this error is not guessing the file name of where `MyLib.hs` could be loaded from; instead, it seems to refer correctly to where the module (previously loaded) was. Hmm.

-----Original Message----- From: Matthew Pickering Sent: Tuesday, June 29, 2021 5:04 PM To: Erdi, Gergo Subject: [External] Re: Loading a typechecked module and then using it immediately as a package

Do you have a `MyLib.hs` source file? If you move that somewhere else (another folder) then things might work?

On Tue, Jun 29, 2021 at 9:41 AM Erdi, Gergo wrote:

...

PUBLIC

What's weird about it is that if I print the `moduleNameProvidersMap`, I can see `MyLib` inside, and it looks no different than any other module from e.g. `ghc-prim` that I can import into `Test.hs` without any package qualification. Also, why does the error message refer to the file name `input/MyLib.hs`? Why does GHC even know that that is where it would have to be loaded from, if it weren't to be used from an already loaded package?

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