Backport #2161: Kernel.eval ignores binding in 1.9

• Status: Closed
• Assignee: -

[awieland (Aaron Wieland)]

=begin
Kernel.eval no longer evaluates its string in the context of the binding passed to it.

In an irb session in 1.8.6:

irb(main):001:0> eval 'self'
=> main
irb(main):002:0> obj = Object.new
=> #Object:0x12aaf20
irb(main):003:0> eval 'self', obj.send(:binding)
=> #Object:0x12aaf20

In 1.9.1 (also tested in the latest nightly build for 1.9.2):

irb(main):001:0> obj = Object.new
=> #Object:0x5210f8
irb(main):002:0> eval 'self', obj.send(:binding)
=> main

I can't help but feel I'm missing something, because a bug of this magnitude should have been identified and fixed by now (it breaks a lot of code that uses ERb).
=end

[wanabe (_ wanabe)]

=begin
It seems that Kernel#eval works fine.

$ ./ruby -ve 'class Foo;def foo;binding;end;end;eval "p self", Foo.new.foo'
ruby 1.9.2dev (2009-10-02 trunk 25185) [i386-mingw32]
#Foo:0xb23f80

I guess obj.send(:binding)' is same as binding' in 1.9.
And it is undefined behavior, because Kernel#binding is a private method.
How about Object#instance_eval instead of it?
=end

[naruse (Yui NARUSE)]

• Status changed from Open to Feedback

=begin

=end

[mame (Yusuke Endoh)]

=begin
Hi,

Rdoc of Kernel#binding says:

Returns a +Binding+ object, describing the variable and
method bindings at the point of call.

In this case, "the point of call" is top level.
So I think 1.9 is correct.

I don't know it is 1.8's bug or spec change since 1.9.
So I move this ticket to 1.8 subproject.

As wanabe said, you can use instance_eval if you want 1.8's
current behavior:

eval "self", obj.instance_eval { binding }

--
Yusuke Endoh [e-mail]
=end

[jeremyevans0 (Jeremy Evans)]

• Tracker changed from Bug to Backport
• Project changed from 2 to 5
• Description updated (diff)
• Status changed from Feedback to Closed
• ruby -v deleted (1.9.1p243 (2009-07-16 revision 24175) [i386-darwin9.8.0])