Hi, I've just installed MzScheme 4.2.5 on OSX 10.6.4 via homebrew, and then downloaded and untared Arc 3.1, but when I run mzscheme -m -f as.scm I keep getting 'Abort Trap'.
I've done a search on the and can't find much info. Appreciate any help. Thx
I use OS X. Consider me an expert on this subject; I'll answer any questions.
As aw says, don't use the "-m" option. Also, use the "-i" option, for "interactive"; without it, when you ctrl-C an Arc session, the whole process will abort, but with it, you'll get a MzScheme prompt, at which point you can use (tl) to return to Arc.
I also highly recommend that you install a tool called rlwrap. It does paren-matching and lets you use arrow keys (or ctrl-N, ctrl-P, ctrl-F, ctrl-B for down, up, right, left) to move around and access previous commands. Here's the command that I suggest you use to start Arc from the arc3.1 folder:
Unfortunately, it doesn't do paren- or quote-matching, and it doesn't interact well with the current arc> prompt.
$ racket -il readline -f as.scm
Welcome to Racket v5.0.2.
Use (quit) to quit, (tl) to return here after an interrupt.
arc>
(+ 1 2)
3
arc>
"bad"
"bad"
arc>
(quit)
With access to the underlying Racket, one can (require readline/readline) and do (readline "arc> ") to get the proper prompt, but a) this requires redoing the Arc REPL, either by hacking (tl) in ac.scm or by writing something like (while t (prn:eval:read ($.readline "arc> "))), and b) it still doesn't do the matching, which I find an important feature.
I haven't tried OSX myself, but with recent versions of MzScheme you should no longer use the "-m" option. Try just "mzscheme -f as.scm" and see if that helps.
Also, if you try just "mzscheme" without any arguments, do you get an mzscheme prompt like this?
Welcome to MzScheme v4.2.4 [3m], Copyright (c) 2004-2010 PLT Scheme Inc.
>
if you still get the "Abort Trap", there's a problem with your MzScheme installation. You could try downloading directly from http://racket-lang.org/download/ (mzscheme got renamed to Racket). If you can't get MzScheme / Racket to work, you can also ask for help over on http://racket-lang.org/community.html
It's wrong. "racket -i -f as.scm" works fine and I've been using it for a few months. (Note that this is for arc3.1, which you are using, so that should be fine.)
thanks waterhouse. Did you install from src? I'm a little unsure about the configure option. I'm assuming "--prefix=/usr/local/racket --enable-macprefix" ?
I didn't install from source, and have no idea about doing that. What I do to install is: Download DrRacket from racket-lang.org. Move it to the Applications folder as is conventional. Add to the ~/.bash_profile the following line:
Now you'll be able to use the "racket" and "mzscheme" and "raco" and all other programs from the "bin" subdirectory by just typing their names. (This applies to any terminal windows opened after you've changed .bash_profile.)
