Ben Gamari
Hi all,
Today I verified that with Luite's recent work on the interpreter it is now possible to run GHC entirely within GHCi (when bootstrapping from GHC 9.2).
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I have fixed the break-array issue noted in the above message in !6848. It is now possible to use `:trace` on GHC itself: $ hadrian/ghci GHCi, version 9.2.1: https://www.haskell.org/ghc/ :? for help . . . λ> import Main λ> :set args -B/opt/exp/ghc/ghc-landing/_build/stage1/lib Hi.hs -v3 -fforce-recomp λ> :set -fbreak-on-error λ> :trace main Glasgow Haskell Compiler, Version 9.3.20211027, stage 1 booted by GHC version 9.2.1 ^CStopped in <exception thrown>, <unknown> _exception :: e = _ [<unknown>] λ> :hist -1 : fromException (/opt/exp/ghc/ghc-landing/compiler/GHC/Utils/Panic.hs:114:19-24) -2 : uniq (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:205:7-10) -3 : moduleNameFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:72:33-35) -4 : stableModuleNameCmp (/opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:62:64-78) -5 : lexicalCompareFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:252:18-25) -6 : uniq (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:205:7-10) -7 : moduleNameFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:72:33-35) -8 : stableModuleNameCmp (/opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:62:29-43) -9 : lexicalCompareFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:252:6-13) -10 : lexicalCompareFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:252:6-25) -11 : lexicalCompareFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:(252,3)-(253,54)) -12 : stableModuleNameCmp (/opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:62:29-78) -13 : compare (/opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:42:23-49) -14 : fs_sbs (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:207:7-12) -15 : lexicalCompareFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:253:44-53) -16 : fs_sbs (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:207:7-12) -17 : lexicalCompareFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:253:31-40) -18 : lexicalCompareFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:253:3-54) -19 : uniq (/opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:205:7-10) -20 : moduleNameFS (/opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:72:33-35) ... [<unknown>] λ> :back Logged breakpoint at /opt/exp/ghc/ghc-landing/compiler/GHC/Utils/Panic.hs:114:19-24 _result :: Maybe GHC.Utils.Panic.Plain.PlainGhcException e :: SomeAsyncException [-1: /opt/exp/ghc/ghc-landing/compiler/GHC/Utils/Panic.hs:114:19-24] λ> :back Logged breakpoint at /opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:205:7-10 _result :: Int uniq :: Int [-2: /opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:205:7-10] λ> uniq 603980920 [-2: /opt/exp/ghc/ghc-landing/compiler/GHC/Data/FastString.hs:205:7-10] λ> :back Logged breakpoint at /opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:72:33-35 _result :: ModuleName mod :: ModuleName [-3: /opt/exp/ghc/ghc-landing/compiler/GHC/Unit/Module/Name.hs:72:33-35] λ> mod ModuleName "GHC.Tc.Solver.Canonical" et cetera