Type representations missing for promoted boxed tuples
This is a continuation of #11120 (closed). It seems there is something odd happening with type representations for boxed tuples,
$ inplace/bin/ghc-stage2 --interactive
GHCi, version 8.1.20160528: http://www.haskell.org/ghc/ :? for help
Prelude> :set -XDataKinds
Prelude> :m + Data.Typeable Data.Proxy
Prelude Data.Typeable Data.Proxy> typeOf (Proxy :: Proxy (Int,Int))
Proxy * (Int,Int)
Prelude Data.Typeable Data.Proxy> typeOf (Proxy :: Proxy '(Int,Int))
GHC error in desugarer lookup in Ghci2:
Can't find interface-file declaration for variable $tc'(,)
Probable cause: bug in .hi-boot file, or inconsistent .hi file
Use -ddump-if-trace to get an idea of which file caused the error
ghc-stage2: panic! (the 'impossible' happened)
(GHC version 8.1.20160528 for x86_64-unknown-linux):
initDs IOEnv failure
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Prelude Data.Typeable Data.Proxy>
This is odd since the $tc'(,)
binding is present in the interface file for GHC.Tuple
,
$ inplace/bin/ghc-stage2 --show-iface libraries/ghc-prim/dist-install/build/GHC/Tuple.dyn_hi |less
...
14e44400752f4580e52ed2a760b9633f
$tc'(,) :: TyCon
{- HasNoCafRefs, Strictness: m,
Unfolding: (TyCon
14407099369839560749##
10712746223293009168##
$trModule
$tc'(,)1) -}
543be63d698612591d2e75b0b60ad643
$tc'(,)1 :: TrName
{- HasNoCafRefs, Strictness: m1, Unfolding: (TrNameS "'(,)"#) -}
...