[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-4.13.0.0:Data.STRef]
    Instantiating p[ShouldFail=base-4.13.0.0:Data.STRef]
    [1 of 1] Compiling ShouldFail[sig]  ( p/ShouldFail.hsig, bkpfail19.out/p/p-CfyUIAu1JTRCDuXEyGszXN/ShouldFail.o )

<no location info>: error:
    • 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]