From: LC Geldenhuys <lcgeldenhuys@...>
Date: 2004-02-17T17:49:53+09:00
Subject: Frozen string problem, but I haven't frozen anything?

Hi,

I am new to Ruby. I'm trying to get some Ruby scripts going to manage
or CVS log message emails. (I haven't written them myself, got them
from the web.)

I get:
/home/cvs/repository/CVSROOT/commitinfo.rb:26:in `tr_s!': can't modify
frozen string (TypeError)
        from /home/cvs/repository/CVSROOT/commitinfo.rb:26

I've done some reading, and I suspect I understand what the frozen
string issue is about. The problem is, I don't see how/why this string
is frozen? Here is the relevant code snippet:

-----------------------------------
if ARGV.size < 4
  puts "Usage: #{$0} CVSROOT USER modulepath file1 [file2...]"
  exit 1	# No way!
end

$cvsroot, $cvsuser, $modulepath, *$cvsfiles = *ARGV

$cvsroot.tr_s!('/', '/')
$modulepath.tr_s!('/', '/')
-----------------------------------

The two lines using 'tr_s!' causes the problem, but I don't see
how/why $cvsroot or $modulepath is 'frozen'? Might it be due to the
fact that they are passed to the script, i.e. some global/local scope
issue?

Regards,
  Lourens