[GHC] #13089: GHC panics when importing Array from Data.Array.Repa

[GHC]

#13089: GHC panics when importing Array from Data.Array.Repa
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        Reporter:  cbaatz            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by RyanGlScott:

@@ -4,0 +4,1 @@
+ {{{#!hs
@@ -6,0 +7,1 @@
+ }}}
@@ -9,0 +11,1 @@
+ {{{#!hs
@@ -10,0 +13,1 @@
+ }}}
@@ -15,1 +19,1 @@
- ```
+ {{{
@@ -28,1 +32,1 @@
- ```
+ }}}

New description:

 I stumbled upon a GHC panic for some reason. The error message is below.
 The error disappears when I replace:

 {{{#!hs
 import           Data.Array.Repa     ((:.) (..), Array, DIM1, DIM2, U, Z
 (..))
 }}}

 with

 {{{#!hs
 import           Data.Array.Repa     ((:.) (..), DIM1, DIM2, U, Z (..))
 }}}

 and I've confirmed that it panics with:

 import           Data.Array.Repa     (Array)

 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.0.1 for x86_64-apple-darwin):
         filterImports/combine
   (Array,
    Array{Array, AByteString, ACursored, ADelayed, AForeignPtr,
 AInterleave, ASmall, APart, AUnboxed, AUndefined, AVector, cursoredExtent,
 loadCursor, makeCursor, shiftCursor},
    Nothing)
   (Array,
    Source{Source, Array, deepSeqArray, extent, index, linearIndex,
 unsafeIndex, unsafeLinearIndex},
    Nothing)
 }}}

--

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13089#comment:3>
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