[GHC] #13202: Levity polymorphism panic in GHCi
#13202: Levity polymorphism panic in GHCi -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- With current `master`, {{{ $ ghci GHCi, version 8.1.20170126: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/ben/.ghci λ> import GHC.Exts λ> :set -XTypeApplications -XMagicHash -XTypeInType λ> data TypeRep (a :: k) = TypeRep λ> let typeRepKind = undefined :: TypeRep (a :: k) -> TypeRep k λ> let typeRep = undefined :: TypeRep (a :: k) λ> let x = typeRepKind (typeRep @(Maybe Int#)) ghc: panic! (the 'impossible' happened) (GHC version 8.1.20170126 for x86_64-unknown-linux): isUnliftedType forall (a :: TYPE q). a :: TYPE q Call stack: CallStack (from HasCallStack): prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1166:58 in ghc:Outputable callStackDoc, called at compiler/utils/Outputable.hs:1170:37 in ghc:Outputable pprPanic, called at compiler/types/Type.hs:1869:10 in ghc:Type Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13202 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13202: Levity polymorphism panic in GHCi -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by adamgundry): I've just seen this as well, in a different context: {{{ GHCi, version 8.1.20170217: http://www.haskell.org/ghc/ :? for help Prelude> import GHC.Records Prelude GHC.Records> :set -XTypeApplications -XDataKinds Prelude GHC.Records> let foo = getField @"name" ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.1.20170217 for x86_64-unknown-linux): isUnliftedType forall (a :: TYPE q). a :: TYPE q Call stack: CallStack (from HasCallStack): prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1197:58 in ghc:Outputable callStackDoc, called at compiler/utils/Outputable.hs:1201:37 in ghc:Outputable pprPanic, called at compiler/types/Type.hs:1889:10 in ghc:Type isUnliftedType, called at compiler/typecheck/TcRnDriver.hs:1822:32 in ghc:TcRnDriver Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13202#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13202: Levity polymorphism panic in GHCi -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: | LevityPolymorphism Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * keywords: => LevityPolymorphism -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13202#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13202: Levity polymorphism panic in GHCi
-------------------------------------+-------------------------------------
Reporter: bgamari | Owner: (none)
Type: bug | Status: new
Priority: high | Milestone: 8.2.1
Component: Compiler | Version: 8.0.1
Resolution: | Keywords:
| LevityPolymorphism
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by Richard Eisenberg
#13202: Levity polymorphism panic in GHCi -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: merge Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: | LevityPolymorphism Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: | ghci/scripts/T13202{,a} Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by goldfire): * status: new => merge * testcase: => ghci/scripts/T13202{,a} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13202#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#13202: Levity polymorphism panic in GHCi -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: closed Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: fixed | Keywords: | LevityPolymorphism Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: | ghci/scripts/T13202{,a} Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: merge => closed * resolution: => fixed Comment: Merged to `ghc-8.2` as 4c6a016900b0e9af382661efc4bb737e47d90d93. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13202#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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