Feature #2018

[irb] BasicObject.new doesn't have an inspect

Added by DanielBovensiepen (Daniel Bovensiepen) over 2 years ago. Updated about 1 year ago.

[ruby-core:25200]
Status:Closed Start date:08/31/2009
Priority:Low Due date:
Assignee:keiju (Keiju Ishitsuka) % Done:

100%
Category:lib
Target version:2.0.0

Description

Using BasicObject.new in irb:

   daniel@boviAir# ruby19 --version
   ruby 1.9.2dev (2009-08-30 trunk 24718) [i386-darwin9.8.0]
   daniel@boviAir# irb19 --version
   irb 0.9.6(09/06/30)
   daniel@boviAir# irb19
   irb(main):001:0> BasicObject.new

Produce an Exception due to the fact that inspect doesn't exist in the BasicObject:

NoMethodError: undefined method `inspect' for #<BasicObject:0x4b2738>
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/inspector.rb:84:in `block in <module:IRB>'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/inspector.rb:30:in `call'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/inspector.rb:30:in `inspect_value'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/context.rb:259:in `inspect_last_value'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:309:in `output_value'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:158:in `block (2 levels) in eval_input'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:271:in `signal_status'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:154:in `block in eval_input'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/ruby-lex.rb:244:in `block (2 levels) in each_top_level_statement'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/ruby-lex.rb:230:in `loop'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/ruby-lex.rb:230:in `block in each_top_level_statement'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `catch'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `each_top_level_statement'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:153:in `eval_input'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:70:in `block in start'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:69:in `catch'
        from /Users/danielbovensiepen/Programs/ruby19/lib/ruby/1.9.1/irb.rb:69:in `start'
        from /Users/danielbovensiepen/Programs/ruby19/bin/irb19:12:in `<main>'Maybe IRB bug!!

In the attachment is a patch for catching this exception.

basicobject_irb.patch - Patch for catching inspect exception in irb (685 Bytes) DanielBovensiepen (Daniel Bovensiepen), 08/31/2009 02:43 am

Associated revisions

Revision 24779
Added by matz (Yukihiro Matsumoto) over 2 years ago

* lib/irb/inspector.rb (IRB::INSPECTORS.def_inspector): support object without #inspect defined. a patch from Daniel Bovensiepen. [ruby-core:25200]

History

#1
Updated by dblack (David Black) over 2 years ago

Hi --

On Mon, 31 Aug 2009, Daniel Bovensiepen wrote:

> Bug #2018: [irb] BasicObject.new doesn't have an inspect
> http://redmine.ruby-lang.org/issues/show/2018

Why is that a bug?


David

-- 
David A. Black / Ruby Power and Light, LLC / http://www.rubypal.com
Ruby/Rails training, mentoring, consulting, code-review
Latest book: The Well-Grounded Rubyist (http://www.manning.com/black2)

September Ruby training in NJ has been POSTPONED. Details to follow.

#2
Updated by hongli (Hongli Lai) over 2 years ago

I thought the whole point of BasicObject is that it doesn't have any methods.

#3
Updated by matz (Yukihiro Matsumoto) over 2 years ago

Hi,

In message "Re: [ruby-core:25201] Re: [Bug #2018] [irb] BasicObject.new doesn't have an inspect"
    on Mon, 31 Aug 2009 02:49:19 +0900, "David A. Black" <dblack@rubypal.com> writes:

|> Bug #2018: [irb] BasicObject.new doesn't have an inspect
|> http://redmine.ruby-lang.org/issues/show/2018
|
|Why is that a bug?

I think it's not the point.  BasicObject has no method (with a few
exception) by its definition.  But irb should handle objects without
inspect defined.

							matz.

#4
Updated by dblack (David Black) over 2 years ago

On Mon, 31 Aug 2009, Yukihiro Matsumoto wrote:

> Hi,
>
> In message "Re: [ruby-core:25201] Re: [Bug #2018] [irb] BasicObject.new doesn't have an inspect"
>    on Mon, 31 Aug 2009 02:49:19 +0900, "David A. Black" <dblack@rubypal.com> writes:
>
> |> Bug #2018: [irb] BasicObject.new doesn't have an inspect
> |> http://redmine.ruby-lang.org/issues/show/2018
> |
> |Why is that a bug?
>
> I think it's not the point.  BasicObject has no method (with a few
> exception) by its definition.  But irb should handle objects without
> inspect defined.

Ah, OK -- I didn't catch onto that.

Actually I really like doing:

   >> b = BasicObject.new

in irb when I'm teaching 1.9 -- very dramatic way to demonstrate the
basicness of BasicObject :-) But I can understand that it should
probably be handled more gracefully.


David

-- 
David A. Black / Ruby Power and Light, LLC / http://www.rubypal.com
Ruby/Rails training, mentoring, consulting, code-review
Latest book: The Well-Grounded Rubyist (http://www.manning.com/black2)

September Ruby training in NJ has been POSTPONED. Details to follow.

#5
Updated by yugui (Yuki Sonoda) over 2 years ago

  • Assignee set to keiju (Keiju Ishitsuka)
  • Target version set to 2.0.0
It is not a bug. But I think enhancement for irb is possible. 
What kind of handling do you want?

#6
Updated by matz (Yukihiro Matsumoto) over 2 years ago

  • Status changed from Open to Closed
  • % Done changed from 0 to 100
Applied in changeset r24779.

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