Windows broken -- again

Simon Peyton Jones simonpj at
Wed Jul 8 10:23:29 UTC 2015

I get this breakage on Windows.  I have no idea who is responsible.  Can someone fix?  It looks as if throwIOIO really is always unused.

utils\ghc-pkg\Main.hs:1982:1: Warning:

    Defined but not used: 'throwIOIO'
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