Compile time error for hash variable in regex, where possible
Compile time error for hash variable in regex, where possible

Improves on #1367 a bit

softmoth/rakudo,nbrown/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,salortiz/rakudo,softmoth/rakudo,nbrown/rakudo,softmoth/rakudo,MasterDuke17/rakudo,tony-o/rakudo,rakudo/rakudo,nbrown/rakudo,salortiz/rakudo,tony-o/rakudo,salortiz/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,rakudo/rakudo,rakudo/rakudo,tbrowder/rakudo,Gnouc/rakudo,nbrown/rakudo,tony-o/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,tony-o/rakudo,lucasbuchala/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,softmoth/rakudo,tony-o/rakudo,tbrowder/rakudo,nbrown/rakudo,salortiz/rakudo,labster/rakudo,Gnouc/rakudo,labster/rakudo,Gnouc/rakudo,salortiz/rakudo,tony-o/rakudo,salortiz/rakudo,rakudo/rakudo,softmoth/rakudo,labster/rakudo,labster/rakudo,tbrowder/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,rakudo/rakudo,nbrown/rakudo,rakudo/rakudo,labster/rakudo,labster/rakudo,tbrowder/rakudo,tbrowder/rakudo,MasterDuke17/rakudo