switch from O2 to O1
switch from O2 to O1

recommended by the GHC manual

AndreasPK/stack,Heather/stack,lukexi/stack,harendra-kumar/stack,akhileshs/stack,kairuku/stack,athanclark/stack,vigoo/stack,juhp/stack,supermario/stack,keent/stack,vigoo/stack,wolftune/stack,meiersi-11ce/stack,Heather/stack,hesselink/stack,anton-dessiatov/stack,joozek78/stack,Denommus/stack,phadej/stack,bollu/stack,rrnewton/stack,rrnewton/stack,rvion/stack,agrafix/stack,deech/stack,rubik/stack,robstewart57/stack,sinelaw/stack,keent/stack,GaloisInc/stack,rvion/stack,robstewart57/stack,narrative/stack,juhp/stack,Denommus/stack,tedkornish/stack,Fuuzetsu/stack,wolftune/stack,mathhun/stack,cocreature/stack,markus1189/stack,martin-kolinek/stack,chadbrewbaker/stack,akhileshs/stack,Blaisorblade/stack,duplode/stack,luigy/stack,mrkkrp/stack,markus1189/stack,cocreature/stack,sjakobi/stack,phadej/stack,mietek/stack,cabrera/stack,cabrera/stack,chreekat/stack,lukexi/stack,athanclark/stack,bixuanzju/stack,agrafix/stack,soenkehahn/stack,achernyak/stack,martin-kolinek/stack,chadbrewbaker/stack,MaxGabriel/stack,soenkehahn/stack,rekka/stack,DanielG/stack,harendra-kumar/stack,ant1441/stack,rekka/stack,MaxGabriel/stack,Blaisorblade/stack,Andrew-the-Ubergeek/stack,k-bx/stack,chreekat/stack,adinapoli/stack,narrative/stack,bixuanzju/stack,fizruk/stack,k-bx/stack,CRogers/stack,AndrewRademacher/stack,CRogers/stack,DanielG/stack,joozek78/stack,wskplho/stack,luigy/stack,AndreasPK/stack,deech/stack,duplode/stack,kairuku/stack,wskplho/stack,fizruk/stack,Fuuzetsu/stack,AndrewRademacher/stack,rubik/stack,mathhun/stack,GaloisInc/stack,adinapoli/stack,mrkkrp/stack,MichielDerhaeg/stack,tedkornish/stack,anton-dessiatov/stack,ant1441/stack,bollu/stack,Andrew-the-Ubergeek/stack,achernyak/stack,sinelaw/stack,supermario/stack,MichielDerhaeg/stack,sjakobi/stack,meiersi-11ce/stack