[GHC] #9123: Need for higher kinded roles

[GHC]

#9123: Need for higher kinded roles
-------------------------------------+-------------------------------------
        Reporter:  simonpj           |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.8.2
  checker)                           |             Keywords:  Roles,
      Resolution:                    |  QuantifiedConstraints
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 RyanGlScott):

 simonpj, that commit doesn't build for me. I get the following error when
 building stage 2:

 {{{
 "inplace/bin/ghc-stage1" -hisuf hi -osuf  o -hcsuf hc -static  -O0 -H64m
 -Wall   -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header
 -Iincludes/dist-ghcconstants/header   -this-unit-id ghc-8.5 -hide-all-
 packages -i -icompiler/backpack -icompiler/basicTypes -icompiler/cmm
 -icompiler/codeGen -icompiler/coreSyn -icompiler/deSugar -icompiler/ghci
 -icompiler/hsSyn -icompiler/iface -icompiler/llvmGen -icompiler/main
 -icompiler/nativeGen -icompiler/parser -icompiler/prelude
 -icompiler/profiling -icompiler/rename -icompiler/simplCore
 -icompiler/simplStg -icompiler/specialise -icompiler/stgSyn
 -icompiler/stranal -icompiler/typecheck -icompiler/types -icompiler/utils
 -icompiler/vectorise -icompiler/stage2/build -Icompiler/stage2/build
 -icompiler/stage2/build/./autogen -Icompiler/stage2/build/./autogen
 -Icompiler/. -Icompiler/parser -Icompiler/utils
 -Icompiler/../rts/dist/build -Icompiler/stage2   -optP-DGHCI -optP-include
 -optPcompiler/stage2/build/./autogen/cabal_macros.h -package-id
 base-4.11.0.0 -package-id deepseq-1.4.3.0 -package-id directory-1.3.1.5
 -package-id process-1.6.2.0 -package-id bytestring-0.10.8.2 -package-id
 binary-0.8.5.1 -package-id time-1.8.0.2 -package-id containers-0.5.10.2
 -package-id array-0.5.2.0 -package-id filepath-1.4.1.2 -package-id
 template-haskell-2.13.0.0 -package-id hpc-0.6.0.3 -package-id
 transformers-0.5.5.0 -package-id ghc-boot-8.5 -package-id ghc-boot-th-8.5
 -package-id ghci-8.5 -package-id unix-2.7.2.2 -package-id terminfo-0.4.1.1
 -Wall -Wno-name-shadowing -Wnoncanonical-monad-instances -Wnoncanonical-
 monadfail-instances -Wnoncanonical-monoid-instances -this-unit-id ghc
 -XHaskell2010 -XNoImplicitPrelude -optc-DTHREADED_RTS
 -DGHCI_TABLES_NEXT_TO_CODE -DSTAGE=2 -Rghc-timing -O0 -Wcpp-undef  -no-
 user-package-db -rtsopts       -Wnoncanonical-monad-instances  -odir
 compiler/stage2/build -hidir compiler/stage2/build -stubdir
 compiler/stage2/build   -dynamic-too -c compiler/typecheck/TcPluginM.hs -o
 compiler/stage2/build/TcPluginM.o -dyno
 compiler/stage2/build/TcPluginM.dyn_o

 compiler/typecheck/TcPluginM.hs:176:38: error:
     • Data constructor not in scope:
         EvExpr :: EvExpr -> TcEvidence.EvTerm
     • Perhaps you meant variable ‘TcM.ctEvExpr’ (imported from TcRnMonad)
       Perhaps you want to add ‘EvExpr’ to the import list
       in the import of ‘TcEvidence’
       (compiler/typecheck/TcPluginM.hs:(72,1)-(73,51)).
     |
 176 |    setEvBind $ mkGivenEvBind new_ev (EvExpr evtm)
     |                                      ^^^^^^
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9123#comment:48>
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