[GHC] #10938: DeriveAnyClass + deriving Bifunctor causes GHC panic
#10938: DeriveAnyClass + deriving Bifunctor causes GHC panic -------------------------------------+------------------------------------- Reporter: erantapaa | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: MacOS X DeriveAnyClass | Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | -------------------------------------+------------------------------------- Attempting the derive Bifunctor with DeriveAnyClass caused this message from GHC: {{{ $ ghc Foo.hs [1 of 1] Compiling Foo ( Foo.hs, Foo.o ) Var/Type length mismatch: [a_an7, b_an8] [] Var/Type length mismatch: [a_an7, b_an8] [] Var/Type length mismatch: [a_an7, b_an8] [] Foo.hs:8:13:ghc: panic! (the 'impossible' happened) (GHC version 7.10.2 for x86_64-apple-darwin): tcTyVarDetails a_an7 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} The code: {{{#!hs {-# LANGUAGE DeriveAnyClass #-} module Foo where import Data.Bifunctor data Blah a b = A a | B b deriving (Bifunctor) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10938 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10938: DeriveAnyClass + deriving Bifunctor causes GHC panic -------------------------------------+------------------------------------- Reporter: erantapaa | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Keywords: Resolution: | DeriveAnyClass Operating System: MacOS X | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): -------------------------------------+------------------------------------- Changes (by thomie): * cc: dreixel (added) * component: Compiler => Compiler (Type checker) Comment: Reproducable with HEAD (ghc-7.11.20151002). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10938#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10938: DeriveAnyClass + deriving Bifunctor causes GHC panic -------------------------------------+------------------------------------- Reporter: erantapaa | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Keywords: Resolution: | DeriveAnyClass Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): -------------------------------------+------------------------------------- Changes (by thomie): * os: MacOS X => Unknown/Multiple -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10938#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10938: DeriveAnyClass + deriving Bifunctor causes GHC panic -------------------------------------+------------------------------------- Reporter: erantapaa | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Keywords: Resolution: duplicate | DeriveAnyClass Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: #9968 | Differential Rev(s): -------------------------------------+------------------------------------- Changes (by dreixel): * status: new => closed * resolution: => duplicate * related: => #9968 Comment: Thanks for reporting, but this is already reported as #9968. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10938#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10938: DeriveAnyClass + deriving Bifunctor causes GHC panic -------------------------------------+------------------------------------- Reporter: erantapaa | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: duplicate | Keywords: deriving Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: #9968 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * keywords: DeriveAnyClass => deriving -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10938#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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