[GHC] #12663: amazonka-ec2 fails to build with --split-objs

[GHC]

#12663: amazonka-ec2 fails to build with --split-objs
-------------------------------------+-------------------------------------
           Reporter:  joehillen      |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Linux
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 I've created a repo for reproducing this bug:
 https://github.com/joehillen/ec2-split-objs-bug

 The bug can appear as either:
 {{{
 [189 of 207] Compiling Network.AWS.EC2.Waiters (
 gen/Network/AWS/EC2/Waiters.hs, .stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0/build/Network/AWS/EC2/Waiters.o )
 [190 of 207] Compiling Network.AWS.EC2.DeleteVPNConnection (
 gen/Network/AWS/EC2/DeleteVPNConnection.hs, .stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0/build/Network/AWS/EC2/DeleteVPNConnection.o
 )
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.0.1 for x86_64-unknown-linux):
         tyThingTyCon Identifier ‘$fFoldableFirst_$cfold’

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}
 or
 {{{
 [189 of 207] Compiling Network.AWS.EC2.Waiters (
 gen/Network/AWS/EC2/Waiters.hs, .stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0/build/Network/AWS/EC2/Waiters.o )
 [190 of 207] Compiling Network.AWS.EC2.DeleteVPNConnection (
 gen/Network/AWS/EC2/DeleteVPNConnection.hs, .stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0/build/Network/AWS/EC2/DeleteVPNConnection.o
 )

 /tmp/stack11/amazonka-
 ec2-1.4.3/gen/Network/AWS/EC2/DeleteVPNConnection.hs:51:25: error:
     • Couldn't match expected type ‘Either a0 a10’
                   with actual type ‘a1 -> ShowS’
     • Probable cause: ‘showsPrec’ is applied to too few arguments
       In the first argument of ‘GHC.Show.showList__’, namely
         ‘(showsPrec 0)’
       In the expression: GHC.Show.showList__ (showsPrec 0)
       In an equation for ‘showList’:
           showList = GHC.Show.showList__ (showsPrec 0)
       When typechecking the code for ‘showList’
         in a derived instance for ‘Show DeleteVPNConnection’:
         To see the code I am typechecking, use -ddump-deriv

 /tmp/stack11/amazonka-
 ec2-1.4.3/gen/Network/AWS/EC2/DeleteVPNConnection.hs:104:23: error:
     • Couldn't match expected type ‘Either a2 a3’
                   with actual type ‘a4 -> ShowS’
     • Probable cause: ‘showsPrec’ is applied to too few arguments
       In the first argument of ‘GHC.Show.showList__’, namely
         ‘(showsPrec 0)’
       In the expression: GHC.Show.showList__ (showsPrec 0)
       In an equation for ‘showList’:
           showList = GHC.Show.showList__ (showsPrec 0)
       When typechecking the code for ‘showList’
         in a derived instance for ‘Show DeleteVPNConnectionResponse’:
         To see the code I am typechecking, use -ddump-deriv
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12663>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler