instance_eval's block argument(s)- documented? purpose?

Question

Just realized that instance_eval yields self as an argument to the associated block (except for a bug in the 1.9.2 version: http://www.ruby-forum.c

Answer 1

I have just dicovered that unlike #instance_eval, which is primarily intended for string evaluation, #instance_exec primarily intended for block evaluation, does not have the described behavior:

o = Object.new
o.instance_exec { |*a| puts "a.size is #{a.size}" }
  => a.size is 0

This is probably an unintended inconsistency, so you might have discovered a bug. Post it on Ruby bugs.