Bug #18390: Enumerator::Lazy#find returns invalid value

• Status: Third Party's Issue
• Assignee: -
• Target version: -
• ruby -v: 3.0.2
• Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[cvss (Kirill Vechera)]

There is a regression bug in #find

# RUBY_VERSION 3.0.2
[1, 2, 3, 4].lazy.find(&:even?) # => nil (ERROR!), expected 2
[1, 2, 3, 4].find(&:even?).find(&:even?) # => 2
# RUBY_VERSION 2.4.1
[1, 2, 3, 4].lazy.find(&:even?) # => 2
[1, 2, 3, 4].find(&:even?) # => 2

[cvss (Kirill Vechera)]

• Description updated (diff)

[cvss (Kirill Vechera)]

• Description updated (diff)

[mame (Yusuke Endoh)]

I cannot reproduce the issue

$ ~/local/bin/ruby -ve 'p [1, 2, 3, 4].lazy.find(&:even?)'
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux]
2

Could you please elaborate what did you do? How did you install your ruby? What platform are you using? Is the script complete? How did you run the script?

[cvss (Kirill Vechera)]

• File ruby_bug.png ruby_bug.png added

I'm not sure about build parameters, I found this bug at the ruby playground https://try.ruby-lang.org/ I'm attaching a screenshot.

[cvss (Kirill Vechera)]

I just found that playground runs Opal, not MRI. Sorry for incorrect addressee, please close the issue.

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Third Party's Issue

[mame (Yusuke Endoh)]

Oh that's good to know. I see you have created a ticket for Opal: https://github.com/opal/opal/issues/2367 . Thank you for your report anyway!