From: Craig Moran <craig.m.moran.ruby@...>
Date: 2005-07-12T04:11:10+09:00
Subject: Re: Standard Library Warnings

On 7/11/05, James Edward Gray II <james@grayproductions.net> wrote:
> I keep running into some warning message from standard libraries.  I  
> always use warnings so they are driving me crazy.
> 
> With the latest release of HighLine, I actually had to build a work- 
> around that captures, disables, and later resets the warning level  
> when calling into readline, because it's my opinion that the warning  
> breaks auto-completion (the warning appears in the middle of your  
> completed word).
> 
> Given that, I thought I would post some warning firing examples in  
> the attempt to get some Ruby core hacker to feel sorry for me and  
> apply a patch or two.  I looked at patching set.rb myself but it  
> seems that there is a hack in there to work around this warning and I  
> couldn't figure out why it doesn't work.
> 
> Here are my examples:
> 
> $ ruby -v
> ruby 1.8.2 (2004-12-25) [powerpc-darwin7.7.0]
> $ cat set_example.rb
> require "set"
> 
> SortedSet.new
> $ ruby -w set_example.rb
> (eval):2: warning: method redefined; discarding old initialize
> $ cat prog_ruby_example_723.rb
> # Sample code from Programing Ruby, page 723
> require 'readline'
> include Readline
> 
> require 'abbrev'
> 
> COMMANDS = %w{ exit inc dec }
> 
> ABBREV = COMMANDS.abbrev
> 
> Readline.completion_proc = proc do |string|
>    ABBREV[string]
> end
> 
> value = 0
> 
> loop do
> 
>    cmd = readline("wibble [#{value}]: ", true)
> 
>    break if cmd.nil?
> 
>    case cmd.strip
>    when "exit"
>      break
>    when "inc"
>      value += 1
>    when "dec"
>      value -= 1
>    else
>      puts "Invalid command #{cmd}"
>    end
> 
> end
> $ ruby -w prog_ruby_example_723.rb
> wibble [0]: dprog_ruby_example_723.rb:19: warning: instance variable  
> completion_case_fold not initialized
> ec
> 
> In that last example, I pushed d then tab to trigger the warning.
> 
> Let me know if I can answer any questions and thanks in advance for  
> taking pity on a warnings-allergic coder.
> 
> James Edward Gray II
> 
> 
>