Backport #8735: Enumerator::Lazy#zip behaves differently from Enumerable#zip when yield with non-single argument

• Status: Closed
• Assignee: nagachika (Tomoyuki Chikanaga)

[kachick (Kenichi Kamiya)]

=begin
Is this intended?

obj = Object.new
def obj.each
yield
yield 1, 2
end

obj.to_enum.zip(obj.to_enum) #=> [[nil, nil],
# [[1, 2], [1, 2]]]

obj.to_enum.lazy.zip(obj.to_enum).force #=> [[false, nil],
# [1, [1, 2]]]
=end

[nobu (Nobuyoshi Nakada)]

• Backport changed from 1.9.3: UNKNOWN, 2.0.0: UNKNOWN to 1.9.3: DONTNEED, 2.0.0: REQUIRED

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r42450.
Kenichi, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

enumerator.c: fix non-single argument

• enumerator.c (lazy_zip_func): fix non-single argument. fix
  out-of-bound access and pack multiple yielded values.
  [ruby-core:56383] [Bug #8735]

[kachick (Kenichi Kamiya)]

Thank you!

[phluid61 (Matthew Kerwin)]

I believe the issue is here:
https://github.com/ruby/ruby/blob/trunk/enumerator.c#L1703

I'd write a patch for the cases argc==0{Qnil} or argc>1{rb_ary_new4(...)}
but I'm away from my computer right now.

Sent from my phone, so excuse the typos.
On Aug 5, 2013 9:30 PM, "kachick (Kenichi Kamiya)" [e-mail]
wrote:

Issue #8735 has been reported by kachick (Kenichi Kamiya).

---

Bug #8735: Enumerator::Lazy#zip behaves differently from Enumerable#zip
when yield with non-single argument
https://bugs.ruby-lang.org/issues/8735

Author: kachick (Kenichi Kamiya)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:
ruby -v: ruby -v ruby 2.1.0dev (2013-08-05 trunk 42385) [i686-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

=begin
Is this intended?

obj = Object.new
def obj.each
yield
yield 1, 2
end

obj.to_enum.zip(obj.to_enum) #=> [[nil, nil],
# [[1, 2], [1, 2]]]

obj.to_enum.lazy.zip(obj.to_enum).force #=> [[false, nil],
# [1, [1, 2]]]
=end

--
http://bugs.ruby-lang.org/

[nagachika (Tomoyuki Chikanaga)]

• Tracker changed from Bug to Backport
• Project changed from Ruby master to Backport200
• Status changed from Closed to Assigned
• Assignee set to nagachika (Tomoyuki Chikanaga)

[nagachika (Tomoyuki Chikanaga)]

• Status changed from Assigned to Closed

This issue was solved with changeset r42922.
Kenichi, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

merge revision(s) 42450: [Backport #8735]

* enumerator.c (lazy_zip_func): fix non-single argument.  fix
  out-of-bound access and pack multiple yielded values.
  [ruby-core:56383] [Bug #8735]