| 7 Jun 2026 |
 MangoIV | Do you have a link to the actual errors (this is missing the errors I think)? Otherwise I can just reproduce tomorrow myself | 21:19:11 |
| 8 Jun 2026 |
 hellwolf | Redacted or Malformed Event | 09:39:22 |
| hellwolf | https://github.com/well-typed/optics/issues/545 | 09:41:08 |
| hellwolf | MangoIV: I am still in zurihac, fwiw. In the work room near aula auditorium. | 09:41:33 |
| hellwolf | is it a ghc bug? | 10:17:26 |
| hellwolf | I am now testing with the tip of ghc's "9.12" branch | 12:50:57 |
| hellwolf | oh, no
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.12.4.20260607:
ASSERT failed!
in_scope InScope {ds_aP9t $dMonoid_s26Ke $dFunctor_s26Kg
$dApplicative_s26Ki lvl_s26Ox lvl_s26OA lvl_s26Wj lvl_s26Wk
lvl_s26Wl lvl_s26Wm}
tenv [a1gar :-> f_a1ga3, a1gas :-> t_a1ga4, a1gat :-> a_a1ga5,
a1gau :-> r_a1ga6]
tenvFVs {f_a1ga3, t_a1ga4, a_a1ga5, r_a1ga6}
cenv []
cenvFVs {}
tys []
cos [<t_a1gas a_a1gat -> Traversed f_a1gar r_a1gau>_R
%<'Many>_N ->_R Sym (N:Forget
<Traversed f_a1gar r_a1gau>_R
<ZonkAny 1>_P
<t_a1gas a_a1gat>_R
<()>_P)]
Call stack:
CallStack (from HasCallStack):
assertPpr, called at compiler/GHC/Core/TyCo/Subst.hs:680:5 in ghc-9.12.4.20260607-inplace:GHC.Core.TyCo.Subst
checkValidSubst, called at compiler/GHC/Core/TyCo/Subst.hs:848:17 in ghc-9.12.4.20260607-inplace:GHC.Core.TyCo.Subst
substCo, called at compiler/GHC/Core/Subst.hs:261:39 in ghc-9.12.4.20260607-inplace:GHC.Core.Subst
substExpr, called at compiler/GHC/Core/Subst.hs:268:37 in ghc-9.12.4.20260607-inplace:GHC.Core.Subst
substExpr, called at compiler/GHC/Core/Subst.hs:272:37 in ghc-9.12.4.20260607-inplace:GHC.Core.Subst
substExpr, called at compiler/GHC/Core/Subst.hs:272:37 in ghc-9.12.4.20260607-inplace:GHC.Core.Subst
substExpr, called at compiler/GHC/Core/Subst.hs:306:28 in ghc-9.12.4.20260607-inplace:GHC.Core.Subst
substBind, called at compiler/GHC/Core/Subst.hs:274:44 in ghc-9.12.4.20260607-inplace:GHC.Core.Subst
substExpr, called at compiler/GHC/Core/Subst.hs:272:37 in ghc-9.12.4.20260607-inplace:GHC.Core.Subst
substExpr, called at src/Test/Inspection/Core.hs:609:18 in inspection-testing-0.6.3-152826bba0790f422bcf299ee350f11f2d91c1b0e54a3e3d07dd75e90d5a68a4:Test.Inspection.Core
Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug
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| 20 May 2021 |
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