mmmm footgun

@mflatt is there a way to compile your chez fork on osx w/o X11? I wanted to poke but it dies on compile very quickly and I don’t see obvious config options for this.

@zenspider That’s an issue with building Chez Scheme that has bothered many. I don’t have an easy workaround, but I think it must be a solvable problem, and I’ll take a look again soon.

Hello everyone! )

I don’t know why, but (list->string (list #\\)) produces double backslash "\\" instead of the single one "\"

Is there any solution to use a backslash like a symbol? By using #\backslash for example (the last one unfortunately doesn’t exist).

Racket uses the same convention as some other programming languages like C, that in literal and printed strings, \ is an escape character. So e.g. "\n" means the newline character ASCII 11. "\r" means the return character ASCII 13. And so on.

They’re actually single characters.

And if you want \, then you use two of them, "\\".

For instance, try (car (string->list (list->string (list #\\)))). It prints #\\.

@dmitryhertz Does that help or am I misunderstanding your question?

Hm, when I try to eval (displayln (list->string '(#/ #\1 #\\ #\2 #/ #\3 #\\ #\4 #/ #\5 #\\))) every backslash behaves itself as expected. So, the result is /1\2/3\4/5\.

I meant above, the problem didn’t exist at all. It was my misunderstanding.

As well as displayln, try print.

@greg Sorry please, all is okay.

Ok, I’ll try print right now

(print (list->string '(#/ #\1 #\\ #\2 #/ #\3 #\\ #\4 #/ #\5 #\\))) the result is "/1\\2/3\\4/5\\".

So print shows you it the same as you’d write it as a Racket literal string — e.g. \\.

display shows you the “result” when displayed — e.g. \.

Maybe I’m explaining the distinction badly here but hopefully you get the idea. :slightly_smiling_face:

Once in awhile it can be confusing.

@greg your explanation is great! Seriously. Thank you! )

Great! Have fun.

Does ; before #\| turn off the multi-line commenting in Racket? It seems to in mine.