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Bug #2788

closed

nil.instance_eval pushes nil onto cref

Added by shugo (Shugo Maeda) about 14 years ago. Updated over 11 years ago.

Status:
Closed
Target version:
ruby -v:
ruby 1.9.2dev (2010-02-18 trunk 26704) [i686-linux]
Backport:
[ruby-core:28324]

Description

=begin
A singleton class definition of nil pushes NilClass onto cref.
It is reasonable because NilClass has nil as the only instance.
However, nil.instance_eval pushes nil onto cref, which means that method definitions are not permitted in that context.

defiant:ruby$ ruby-trunk -ve 'class <<nil; def foo; puts "foo" end; end; nil.foo'
ruby 1.9.2dev (2010-02-18 trunk 26704) [i686-linux]
foo
defiant:ruby$ ruby-trunk -ve 'nil.instance_eval {|i| def foo; puts "foo" end }; nil.foo'
ruby 1.9.2dev (2010-02-18 trunk 26704) [i686-linux]
-e:1:in block in <main>': no class/module to add method (TypeError) from -e:1:in instance_eval'
from -e:1:in `'

The behavior is the same in Ruby 1.8.7.
Is it intended or a bug?
=end

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