Add simple List.shift (still needs fail() for a full implementation).
Add simple List.shift (still needs fail() for a full implementation).

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