[Grammar] Permit ">>" after infix:<->.
[Grammar] Permit ">>" after infix:<->.

This fixes RT #77800.

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