Fix compilation on GHC 7.8 (AMP strikes again!)
Fix compilation on GHC 7.8 (AMP strikes again!)

phadej/stack,Fuuzetsu/stack,rubik/stack,mathhun/stack,phadej/stack,AndrewRademacher/stack,MichielDerhaeg/stack,rvion/stack,deech/stack,anton-dessiatov/stack,supermario/stack,Heather/stack,sjakobi/stack,Heather/stack,narrative/stack,martin-kolinek/stack,mrkkrp/stack,narrative/stack,meiersi-11ce/stack,deech/stack,vigoo/stack,vigoo/stack,mathhun/stack,Fuuzetsu/stack,juhp/stack,keent/stack,luigy/stack,rvion/stack,lukexi/stack,harendra-kumar/stack,meiersi-11ce/stack,sjakobi/stack,anton-dessiatov/stack,fizruk/stack,AndreasPK/stack,mrkkrp/stack,achernyak/stack,AndreasPK/stack,MichielDerhaeg/stack,supermario/stack,juhp/stack,achernyak/stack,keent/stack,rubik/stack,fizruk/stack,luigy/stack,harendra-kumar/stack,AndrewRademacher/stack,lukexi/stack,martin-kolinek/stack,Blaisorblade/stack,Blaisorblade/stack