[racket-users] how to implement chez scheme's unread-char on racket?

hi: I want to use unread-char in racket, but I do not know how to implement ? Anyone can help me? Thank you! -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to

[racket-users] help me make this lexer compile on racket !

hi: https://gist.github.com/zhu-fei/14392eb5eae29607db72b1b7a09194d4 I want to compile this piece of code on racket , these code can compile with chez scheme , but not racket , anyone can help me out? thank you! -- You received this message because you are subscribed to the Google Grou