From: "Юрий Соколов" <funny.falcon@...>
Date: 2012-01-20T20:52:08+09:00
Subject: [ruby-core:42190] Re: [ruby-trunk - Bug #5914][Open] Calling extend with an anonymous module requires use of parentheses

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When you call without parentheses, then block `do` is going to `extend`
method, but not `Module.new`

2012/1/20 Mark Somerville <mark@scottishclimbs.com>

>
> Issue #5914 has been reported by Mark Somerville.
>
> ----------------------------------------
> Bug #5914: Calling extend with an anonymous module requires use of
> parentheses
> https://bugs.ruby-lang.org/issues/5914
>
> Author: Mark Somerville
> Status: Open
> Priority: Normal
> Assignee:
> Category:
> Target version:
> ruby -v: 2.0.0dev
>
>
> =begin
>
> Given Ruby 2.0.0dev, 1.9.3 or 1.8.7 and this code:
>
>  class Dude
>    def initialize
>      extend Module.new do
>        def hello
>          puts "Word!"
>        end
>      end
>    end
>  end
>
>  Dude.new.hello
>
> No warning is given, but it does not behave how I expect and throws a
> NoMethodError.
>
> However, if parentheses are used on the call to extend, things behave as
> expected:
>
>  class Dude
>    def initialize
>      extend(Module.new do
>        def hello
>          puts "Word!"
>        end
>      end)
>    end
>  end
>
>  Dude.new.hello
>  => Word!
>
> I don't understand what is happening in the first case (without
> parentheses). Is this a bug or a misunderstanding on my part?
>
> =end
>
>
> --
> http://bugs.ruby-lang.org/
>
>

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When you call without parentheses, then block `do` is going to `extend` met=
hod, but not `Module.new`<br><br><div class=3D"gmail_quote">2012/1/20 Mark =
Somerville <span dir=3D"ltr">&lt;<a href=3D"mailto:mark@scottishclimbs.com"=
>mark@scottishclimbs.com</a>&gt;</span><br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><br>
Issue #5914 has been reported by Mark Somerville.<br>
<br>
----------------------------------------<br>
Bug #5914: Calling extend with an anonymous module requires use of parenthe=
ses<br>
<a href=3D"https://bugs.ruby-lang.org/issues/5914" target=3D"_blank">https:=
//bugs.ruby-lang.org/issues/5914</a><br>
<br>
Author: Mark Somerville<br>
Status: Open<br>
Priority: Normal<br>
Assignee:<br>
Category:<br>
Target version:<br>
ruby -v: 2.0.0dev<br>
<br>
<br>
=3Dbegin<br>
<br>
Given Ruby 2.0.0dev, 1.9.3 or 1.8.7 and this code:<br>
<br>
 =A0class Dude<br>
 =A0 =A0def initialize<br>
 =A0 =A0 =A0extend Module.new do<br>
 =A0 =A0 =A0 =A0def hello<br>
 =A0 =A0 =A0 =A0 =A0puts &quot;Word!&quot;<br>
 =A0 =A0 =A0 =A0end<br>
 =A0 =A0 =A0end<br>
 =A0 =A0end<br>
 =A0end<br>
<br>
 =A0Dude.new.hello<br>
<br>
No warning is given, but it does not behave how I expect and throws a NoMet=
hodError.<br>
<br>
However, if parentheses are used on the call to extend, things behave as ex=
pected:<br>
<br>
 =A0class Dude<br>
 =A0 =A0def initialize<br>
 =A0 =A0 =A0extend(Module.new do<br>
 =A0 =A0 =A0 =A0def hello<br>
 =A0 =A0 =A0 =A0 =A0puts &quot;Word!&quot;<br>
 =A0 =A0 =A0 =A0end<br>
 =A0 =A0 =A0end)<br>
 =A0 =A0end<br>
 =A0end<br>
<br>
 =A0Dude.new.hello<br>
 =A0=3D&gt; Word!<br>
<br>
I don&#39;t understand what is happening in the first case (without parenth=
eses). Is this a bug or a misunderstanding on my part?<br>
<br>
=3Dend<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
--<br>
<a href=3D"http://bugs.ruby-lang.org/" target=3D"_blank">http://bugs.ruby-l=
ang.org/</a><br>
<br>
</font></span></blockquote></div><br>

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