Bug #21778: Binding#eval vs implicit parameters

• Status: Rejected
• Assignee: -
• Target version: -
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN

[zverok (Victor Shepelev)]

This works:

proc { |x| binding.eval('x') }.call(1) #=> 1

This doesn't (neither with numbered parameters, nor with it):

proc { _1; binding.eval('_1') }.call(1) # undefined local variable or method '_1' for main (NameError)

...even though binding is "aware" of _1 existence with implicit_parameters.

I don't think it is a "huge" bug or even practical one. I just wanted to highlight that maybe Binding#eval lacks some context that it should have?..

Or maybe it is my misunderstanding of Binding#eval, I expected that any code that will work in the place of a binding literally, should work in eval as well.

[mame (Yusuke Endoh)]

• Related to Bug #21049: Reconsider handling of the numbered parameters and "it" parameter in `Binding#local_variables` added

[mame (Yusuke Endoh)]

• Status changed from Open to Rejected

This was pointed by @ko1 (Koichi Sasada) at the dev meeting in the discussion of #21049, and we agreed not to implement it. Implementing it would require the parser to accept more detailed outer context, and that effort was not worth. Sorry it wasn't clearly written in the dev meeting log.

[zverok (Victor Shepelev)]

@mame (Yusuke Endoh) Thank you for the clarification!