From: C Erler <erlercw@...>
Date: 2005-04-25T13:07:17+09:00
Subject: Re: profiler.rb Schroedinbug

On 24/04/05, H. Yamamoto <ocean@m2.ccsnet.ne.jp> wrote:
> >A ruby program with the single instruction "require 'profile'"
> >(or with a small program attached afterward) fails on Ruby 1.8
> >and 1.9.
> >
> >c:/ruby/lib/ruby/1.8/profiler.rb:30: undefined method `[]' for
> >nil:NilClass (NoMethodError)
> 
> Maybe, did you require "profile.rb" on irb?
> 
> E:\ruby-cvs\bcc32>irb19
> irb(main):001:0> require "profile"
>   %   cumulative   self              self     total
>  time   seconds   seconds    calls  ms/call  ms/call  name
> 1600.00     0.16      0.16        1   160.00   160.00  Profiler__.start_profile
>   0.00     0.16      0.00        1     0.00     0.00  IRB::Irb#signal_status
>   0.00     0.16      0.00        1     0.00     0.00  RubyLex#each_top_level_sta
> tement
>   0.00     0.16      0.00        1     0.00   160.00  IRB::WorkSpace#evaluate
>   0.00     0.16      0.00        1     0.00     0.00  IRB.start
>   0.00     0.16      0.00        2     0.00     0.00  Module#===
>   0.00     0.16      0.00        1     0.00     0.00  IRB::Context#evaluate
>   0.00     0.16      0.00        1     0.00    10.00  #toplevel
>   0.00     0.16      0.00        1     0.00     0.00  IRB::Irb#eval_input
> E:/ruby-cvs/ruby/lib/profiler.rb:27: undefined method `[]' for nil:NilClass (NoM
> ethodError)
>         from E:/ruby-cvs/ruby/lib/profiler.rb:5:in `start'
>         from E:/ruby-cvs/ruby/lib/irb.rb:51:in `start'
>         from ../ruby/bin/irb:13
> 
> I couldn't reproduce the problem outside of irb.
> 
> E:\ruby-cvs\bcc32>ruby19 -rprofile -e ""
>   %   cumulative   self              self     total
>  time   seconds   seconds    calls  ms/call  ms/call  name
> 400.00     0.04      0.04        1    40.00    40.00  Profiler__.start_profile
>   0.00     0.04      0.00        1     0.00    10.00  #toplevel

Neither irb nor ruby -rprofile cause the bug for me.  It happens when
I simply make a blank file with require 'profile' in it, then run ruby
thefile.rb.

C:\Documents and Settings\User\Desktop>echo require 'profile' > test.rb

C:\Documents and Settings\User\Desktop>ruby test.rb
  %   cumulative   self              self     total
 time   seconds   seconds    calls  ms/call  ms/call  name
3700.00     0.37      0.37        1   370.00   370.00  Profiler__.start_profile
  0.00     0.37      0.00        1     0.00    10.00  #toplevel
  0.00     0.37      0.00        1     0.00   370.00  Kernel.require
c:/ruby/lib/ruby/1.8/profiler.rb:30: undefined method `[]' for
nil:NilClass (NoMethodError)
        from c:/ruby/lib/ruby/1.8/profiler.rb:5:in `require'
        from test.rb:1:in `require'
        from test.rb:1