Idiomatically determine all the characters that can be used for symbols: Difference between revisions

This code works by compiling "var <char>". Since "var ;" is valid syntax (dead code), ";" is a false positive. We could also use "fcn <char>{}" but "fcn {}" is lambda syntax, so space would be a false positive. "_" is excluded because it is not valid variable name although it can be anywhere in a multi-character name.