Work around broken Positive instance in QuickCheck
Work around broken Positive instance in QuickCheck

--HG--
extra : rebase_source : 94683c1eb50dc3a1b6223cb0ef1788523ec5212e
extra : histedit_source : 78bbc783bfd3e1e060a19ed5db7b270742e4db50

aloiscochard/text,23Skidoo/text,hvr/text,aloiscochard/text,beni55/text,alexliew/text,aloiscochard/text,spencerjanssen/text,spencerjanssen/text,bos/text,bgamari/text,spencerjanssen/text,hvr/text,text-utf8/text,23Skidoo/text,23Skidoo/text,alexliew/text,bos/text,hvr/text,bgamari/text,bgamari/text,bgamari/text,alexliew/text,bos/text,text-utf8/text,aloiscochard/text,text-utf8/text,hvr/text,spencerjanssen/text,beni55/text,text-utf8/text,beni55/text,bos/text,alexliew/text,23Skidoo/text,beni55/text