CoreToStg Asserts

[lonetiger at gmail.com]

Hi Ömer,

Thanks for the pointers, should help me find out more.

It’s not a stock GHC as I’m working on getting Dynamic linking back on Windows.

This assert is triggered on the dyn version of the libs. So something’s bit rotted here.

Cheers,
Tamar

From: Ömer Sinan Ağacan
Sent: Tuesday, June 14, 2016 18:46
To: Phyx
Cc: ghc-devs at haskell.org
Subject: Re: CoreToStg Asserts

Hi Tamar,

Have a look at Note [Disgusting computation of CafRefs] in TidyPgm.hs. The
assertion triggered here is the one that checks `hasCafRefs` mentioned in that
note matches with actual CAF-ness.

Are you using stock GHC? Which version? Do you have a minimal program that
reproduces this?

2016-06-13 7:01 GMT-04:00 Phyx <lonetiger at gmail.com>:
> Hi *,
>
> I'm hoping someone could help me understand what the asserts in CoreToStg on
> line 240 and 216 are trying to tell me.
>
> I hit both of them while trying to compile libraries as dyn.
>
> WARNING: file compiler\stgSyn\CoreToStg.hs, line 250
>   $trModule2 False True
> ghc-stage1.exe: panic! (the 'impossible' happened)
>   (GHC version 8.1.20160612 for x86_64-unknown-mingw32):
>         ASSERT failed!
>   file compiler\stgSyn\CoreToStg.hs line 216 $trModule2
>
> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
>
> WARNING: file compiler\simplCore\SimplCore.hs, line 633
>   Simplifier bailing out after 4 iterations [6737, 736, 51, 9]
>     Size = {terms: 12,990, types: 9,998, coercions: 443}
> WARNING: file compiler\stgSyn\CoreToStg.hs, line 250
>   $fEqBigNat_$c/= False True
> ghc-stage1.exe: panic! (the 'impossible' happened)
>   (GHC version 8.1.20160612 for x86_64-unknown-mingw32):
>         ASSERT failed!
>   file compiler\stgSyn\CoreToStg.hs line 240
>   [$fEqBigNat_$c/=, $fEqBigNat]
>
> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
>
> Kind Regards,
> Tamar
>
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