GHC 7.10.3 sometimes reports unimplemented/strange closure type 63270

This happened when building http-link-header.

ghc: internal error: scavenge: unimplemented/strange closure type 63270 @ 0xf36de0a8ghc: internal error: scavenge: unimplemented/strange closure type 63270 @ 0xf36de0a8
    (GHC version 7.10.3 for powerpc_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Sometimes it segfaults instead.

Trac metadata

Trac field	Value
Version	7.10.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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