From: Joe Swatosh <joe.swatosh@...>
Date: 2015-03-13T22:40:59-07:00
Subject: [ruby-core:68520] Possible regression in 2.1 and 2.2 in binding	when combined with delegate?

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# The following code

require 'delegate'
require 'erb'

class Example < SimpleDelegator
  def generate()
template = "config = <%= config %>\n\n"
    puts ERB.new(template).result(create_bindable_context(self))
  end

  def create_bindable_context(config)
    binding
  end
end

C = Struct.new(:a,:b)
Example.new(C.new(:alpha, :beta)).generate

#######################################################################
# Results in

ruby 1.8.7 (2011-12-28 patchlevel 357) [i386-mingw32]

config = #<struct C a=:alpha, b=:beta>


ruby 1.9.3p551 (2014-11-13) [i386-mingw32]

config = #<struct C a=:alpha, b=:beta>


ruby 2.0.0p598 (2014-11-13) [i386-mingw32]

config = #<struct C a=:alpha, b=:beta>


ruby 2.1.5p273 (2014-11-13 revision 48405) [i386-mingw32]

(erb):1:in `method_missing': undefined local variable or method `config'
for #<struct C a=:alpha, b=:beta> (NameError)
        from C:/Ruby/ruby-2.1.5-i386-mingw32/lib/ruby/2.1.0/erb.rb:850:in
`eval'
        from C:/Ruby/ruby-2.1.5-i386-mingw32/lib/ruby/2.1.0/erb.rb:850:in
`result'
        from demo.rb:7:in `generate'
        from demo.rb:16:in `<main>'

ruby 2.2.1p85 (2015-02-26 revision 49769) [i386-mingw32]

(erb):1:in `method_missing': undefined local variable or method `config'
for #<struct C a=:alpha, b=:beta> (NameError)
        from C:/Ruby/ruby-2.2.1-i386-mingw32/lib/ruby/2.2.0/erb.rb:863:in
`eval'
        from C:/Ruby/ruby-2.2.1-i386-mingw32/lib/ruby/2.2.0/erb.rb:863:in
`result'
        from demo.rb:7:in `generate'
        from demo.rb:16:in `<main>'

#######################################################################

Regression or yet another thing I don't understand?

Thanks
--
Joe

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<div dir=3D"ltr"><div># The following code=C2=A0</div><div><br></div><div>r=
equire &#39;delegate&#39;</div><div>require &#39;erb&#39;</div><div><br></d=
iv><div>class Example &lt; SimpleDelegator</div><div>=C2=A0 def generate()<=
/div><div><span class=3D"" style=3D"white-space:pre">    </span>template =
=3D &quot;config =3D &lt;%=3D config %&gt;\n\n&quot;</div><div>=C2=A0 =C2=
=A0 puts ERB.new(template).result(create_bindable_context(self))</div><div>=
=C2=A0 end</div><div>=C2=A0</div><div>=C2=A0 def create_bindable_context(co=
nfig)</div><div>=C2=A0 =C2=A0 binding</div><div>=C2=A0 end</div><div>end</d=
iv><div><br></div><div>C =3D Struct.new(:a,:b)</div><div>Example.new(C.new(=
:alpha, :beta)).generate</div><div><br></div><div>#########################=
##############################################</div><div># Results in</div>=
<div><br></div><div>ruby 1.8.7 (2011-12-28 patchlevel 357) [i386-mingw32]</=
div><div><br></div><div>config =3D #&lt;struct C a=3D:alpha, b=3D:beta&gt;<=
/div><div><br></div><div><br></div><div>ruby 1.9.3p551 (2014-11-13) [i386-m=
ingw32]</div><div><br></div><div>config =3D #&lt;struct C a=3D:alpha, b=3D:=
beta&gt;</div><div><br></div><div><br></div><div>ruby 2.0.0p598 (2014-11-13=
) [i386-mingw32]</div><div><br></div><div>config =3D #&lt;struct C a=3D:alp=
ha, b=3D:beta&gt;</div><div><br></div><div><br></div><div>ruby 2.1.5p273 (2=
014-11-13 revision 48405) [i386-mingw32]</div><div><br></div><div>(erb):1:i=
n `method_missing&#39;: undefined local variable or method `config&#39; for=
 #&lt;struct C a=3D:alpha, b=3D:beta&gt; (NameError)</div><div>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 from C:/Ruby/ruby-2.1.5-i386-mingw32/lib/ruby/2.1.0/erb.r=
b:850:in `eval&#39;</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 from C:/Ruby/ruby=
-2.1.5-i386-mingw32/lib/ruby/2.1.0/erb.rb:850:in `result&#39;</div><div>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 from demo.rb:7:in `generate&#39;</div><div>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 from demo.rb:16:in `&lt;main&gt;&#39;</div><div><br></=
div><div>ruby 2.2.1p85 (2015-02-26 revision 49769) [i386-mingw32]</div><div=
><br></div><div>(erb):1:in `method_missing&#39;: undefined local variable o=
r method `config&#39; for #&lt;struct C a=3D:alpha, b=3D:beta&gt; (NameErro=
r)</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 from C:/Ruby/ruby-2.2.1-i386-mingw=
32/lib/ruby/2.2.0/erb.rb:863:in `eval&#39;</div><div>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 from C:/Ruby/ruby-2.2.1-i386-mingw32/lib/ruby/2.2.0/erb.rb:863:in `r=
esult&#39;</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 from demo.rb:7:in `generat=
e&#39;</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 from demo.rb:16:in `&lt;main&g=
t;&#39;</div><div><br></div><div>##########################################=
#############################</div><div><br></div><div>Regression or yet an=
other thing I don&#39;t understand?</div><div><br></div><div>Thanks=C2=A0</=
div><div>--</div><div>Joe</div><div><br></div></div>

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