Ruby

The following code behaviour totally change since ruby 2.0.0

class Foo def bar(*args) attribute(:bar, *args) end def attribute(name) puts name end end foo = Foo.new begin foo.bar(100) rescue => e puts e.class.name end foo.bar # legit 5.times do foo.bar(100) end puts 'No errors??? WTF???' 

ruby < 2.0 output:

ArgumentError bar (eval):3:in `attribute': wrong number of arguments (2 for 1) (ArgumentError) from (eval):3:in `bar' from foo.rb:28 from foo.rb:27:in `times' from foo.rb:27 

Which is expected.

But ruby >= 2.0 output

ArgumentError bar bar bar bar bar bar No errors??? WTF??? 

In short, after the first successful call, the extra arguments are just ignored. I have no idea of what is going on here, but it look like a broken optimization.

All rubies >= 2.0 are affected. 1.8.7 and 1.9.3 are fine.

Regards.

A gist describing the issue: https://gist.github.com/byroot/9495455