Bug #17814: inconsistent Array.zip behavior

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
• Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[dzwdz (Kuba Prawdziwe-Nazwisko)]

When using Array.zip with an enumerator, it "eats" an additional element off the end of it. Enumerable.zip has the expected behavior of only taking as many elements as it needs to.

I've tested this on local ruby 2.7.2 and ruby 3.0.1 on carc.in.

[dzwdz (Kuba Prawdziwe-Nazwisko)]

note: sorry for the weird Fiber thing in the example code, that's not related to the bug

an enumerator created with

step = 0.step
e = Enumerator.produce { step.next }

would also have the same bug

[mame (Yusuke Endoh)]

Good catch! https://github.com/ruby/ruby/pull/4389

[mame (Yusuke Endoh)]

• Status changed from Open to Closed

Applied in changeset git|fb04c69418ceee696a114fe31279cf3a5ea16d30.

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array.c (rb_ary_zip): take only as many as needed from an Enumerator (#4389)

[Bug #17814]