Loading a typechecked module and then using it immediately as a package

[Erdi, Gergo]

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 <matthewtpickering at gmail.com> 
Sent: Tuesday, June 29, 2021 6:34 PM
To: Erdi, Gergo <Gergo.Erdi at sc.com>
Cc: ghc-devs at haskell.org
Subject: [External] Re: Loading a typechecked module and then using it immediately as a package

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Are you clearing the FinderCache?

On Tue, Jun 29, 2021 at 11:14 AM Erdi, Gergo <Gergo.Erdi at sc.com> 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 <matthewtpickering at gmail.com>
> 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 <matthewtpickering at gmail.com>
> Sent: Tuesday, June 29, 2021 5:04 PM
> To: Erdi, Gergo <Gergo.Erdi at sc.com>
> 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 <Gergo.Erdi at sc.com> 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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