Core lint error in T3001-2 [7.0 regression]

T3001-2(prof_hb) is producing the following Core Lint failure:

=====> T3001-2(prof_hb) 4 of 5 [0, 0, 0]
cd . && '/64playpen/simonmar/nightly/HEAD-cam-04-unx/x86_64-unknown-linux/inplace/bin/ghc-stage2' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-conf -rtsopts  -o T3001-2 T3001-2.hs -O -prof -auto-all -package bytestring  >T3001-2.comp.stderr 2>&1
Compile failed (status 256) errors were:
[1 of 1] Compiling Main             ( T3001-2.hs, T3001-2.o )

T3001-2.hs:23:1:
    Warning: In the use of `unsafePerformIO'
             (imported from Foreign):
             Deprecated: "Use System.IO.Unsafe.unsafePerformIO instead; This function will be removed in the next release"
*** Core Lint errors : in result of Simplifier SimplMode {Phase = 0 [final],
                                                          inline,
                                                          rules,
                                                          eta-expand,
                                                          case-of-case} max-iterations=4 ***
<no location info>:
    [RHS of m'_s326 :: Main.Get [GHC.Types.Char]]
    Demand type has  1  arguments, rhs has  0 arguments,  m'_s326
    Binder's strictness signature: DmdType Lm

Trac metadata

Trac field	Value
Version	7.0.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Compiler
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