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[1 of 2] Processing p
  [1 of 1] Compiling ShouldFail[sig]  ( p\ShouldFail.hsig, nothing )
[2 of 2] Processing q
  Instantiating q
  [1 of 1] Including p[ShouldFail=base-4.18.0.0:Data.STRef]
    Instantiating p[ShouldFail=base-4.18.0.0:Data.STRef]
    [1 of 1] Compiling ShouldFail[sig]  ( p\ShouldFail.hsig, bkpfail19.out\p\p-CfyUIAu1JTRCDuXEyGszXN\ShouldFail.o )

<no location info>: error: [GHC-12424]
    • The hsig file (re)exports ‘Data.STRef.Lazy.newSTRef’
      but the implementing module exports a different identifier ‘GHC.STRef.newSTRef’
    • While checking that ‘Data.STRef’ implements signature ‘ShouldFail’ in ‘p[ShouldFail=Data.STRef]’.