change identifiers to be more strict a-zA-Z0-9, allow underscores in identifiers (but not at start), reuse digit/letter groupings where possible
change identifiers to be more strict a-zA-Z0-9, allow underscores in identifiers (but not at start), reuse digit/letter groupings where possible

boalang/compiler,boalang/compiler,boalang/compiler,boalang/compiler,boalang/compiler