Only include position pointer if we have $.pre.
Only include position pointer if we have $.pre.

Avoids spitting out compile-time errors with a "----->" followed by
nothing.

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