If we use is also, we need to check the class we're trying to extend already exists.
If we use is also, we need to check the class we're trying to extend already exists.

rjbs/rakudo,jonathanstowe/rakudo,rjbs/rakudo,rakudo/rakudo,azawawi/rakudo,azawawi/rakudo,paultcochrane/rakudo,ungrim97/rakudo,softmoth/rakudo,sergot/rakudo,MasterDuke17/rakudo,dwarring/rakudo,samcv/rakudo,b2gills/rakudo,tony-o/deb-rakudodaily,tbrowder/rakudo,b2gills/rakudo,pmurias/rakudo,MasterDuke17/rakudo,samcv/rakudo,jonathanstowe/rakudo,lucasbuchala/rakudo,paultcochrane/rakudo,salortiz/rakudo,pmurias/rakudo,tbrowder/rakudo,ab5tract/rakudo,cognominal/rakudo,zostay/rakudo,nunorc/rakudo,retupmoca/rakudo,Gnouc/rakudo,niner/rakudo,b2gills/rakudo,tony-o/rakudo,tbrowder/rakudo,cygx/rakudo,ugexe/rakudo,labster/rakudo,ugexe/rakudo,azawawi/rakudo,cognominal/rakudo,retupmoca/rakudo,softmoth/rakudo,salortiz/rakudo,pmurias/rakudo,tony-o/deb-rakudodaily,tony-o/rakudo,sjn/rakudo,labster/rakudo,MasterDuke17/rakudo,cognominal/rakudo,labster/rakudo,paultcochrane/rakudo,pmurias/rakudo,dwarring/rakudo,ugexe/rakudo,dwarring/rakudo,sjn/rakudo,rakudo/rakudo,dankogai/rakudo,tony-o/deb-rakudodaily,raydiak/rakudo,ab5tract/rakudo,sjn/rakudo,skids/rakudo,tony-o/rakudo,skids/rakudo,azawawi/rakudo,cygx/rakudo,nunorc/rakudo,salortiz/rakudo,usev6/rakudo,tbrowder/rakudo,nunorc/rakudo,teodozjan/rakudo,ab5tract/rakudo,lucasbuchala/rakudo,b2gills/rakudo,dankogai/rakudo,samcv/rakudo,ab5tract/rakudo,cygx/rakudo,tony-o/deb-rakudodaily,ungrim97/rakudo,retupmoca/rakudo,sjn/rakudo,cygx/rakudo,lucasbuchala/rakudo,LLFourn/rakudo,skids/rakudo,awwaiid/rakudo,awwaiid/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,nbrown/rakudo,labster/rakudo,samcv/rakudo,raydiak/rakudo,laben/rakudo,tony-o/rakudo,rjbs/rakudo,LLFourn/rakudo,tbrowder/rakudo,tony-o/deb-rakudodaily,rakudo/rakudo,labster/rakudo,usev6/rakudo,raydiak/rakudo,softmoth/rakudo,nunorc/rakudo,zhuomingliang/rakudo,tbrowder/rakudo,awwaiid/rakudo,teodozjan/rakudo,raydiak/rakudo,MasterDuke17/rakudo,ab5tract/rakudo,salortiz/rakudo,dankogai/rakudo,nbrown/rakudo,Gnouc/rakudo,zhuomingliang/rakudo,dankogai/rakudo,paultcochrane/rakudo,mrgetit/rakudo,jonathanstowe/rakudo,zhuomingliang/rakudo,LLFourn/rakudo,zhuomingliang/rakudo,retupmoca/rakudo,softmoth/rakudo,laben/rakudo,nbrown/rakudo,ungrim97/rakudo,sjn/rakudo,tony-o/rakudo,b2gills/rakudo,salortiz/rakudo,dwarring/rakudo,awwaiid/rakudo,awwaiid/rakudo,usev6/rakudo,laben/rakudo,Gnouc/rakudo,Leont/rakudo,skids/rakudo,Leont/rakudo,samcv/rakudo,skids/rakudo,nbrown/rakudo,niner/rakudo,cygx/rakudo,Leont/rakudo,dankogai/rakudo,lucasbuchala/rakudo,tony-o/deb-rakudodaily,teodozjan/rakudo,teodozjan/rakudo,niner/rakudo,lucasbuchala/rakudo,nbrown/rakudo,tony-o/rakudo,jonathanstowe/rakudo,Leont/rakudo,sergot/rakudo,MasterDuke17/rakudo,cognominal/rakudo,cognominal/rakudo,azawawi/rakudo,usev6/rakudo,rakudo/rakudo,labster/rakudo,tony-o/deb-rakudodaily,ungrim97/rakudo,sergot/rakudo,nbrown/rakudo,ungrim97/rakudo,rakudo/rakudo,zostay/rakudo,rakudo/rakudo,dakkar/rakudo,zostay/rakudo,MasterDuke17/rakudo,ugexe/rakudo,laben/rakudo,LLFourn/rakudo,zostay/rakudo,ugexe/rakudo,Gnouc/rakudo,paultcochrane/rakudo,LLFourn/rakudo,usev6/rakudo,Gnouc/rakudo,sergot/rakudo,softmoth/rakudo,salortiz/rakudo,niner/rakudo