Bug #14805: Enumerator#count is silently limited to int32

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin17]
• Backport: 2.3: REQUIRED, 2.4: DONE, 2.5: DONE

[amadan (Goran Topic)]

One takes for granted that integers will be promoted into bigints in Ruby when needed.
Not so with Enumerator#count:

2147483647.times.count
# => 2147483647 
2147483648.times.count
# => -2147483648

(notice the minus!)

[duerst (Martin Dürst)]

Confirmed on trunk.

[shan (Shannon Skipper)]

It's interestingly also negative on JRuby. Headius noted in the #ruby IRC channel that this patch would fix the issue for JRuby.

It's positive in TruffleRuby.

It's also positive in Rubinius, but takes about half and hour to calculate and uses ~5GB of RAM. :-O Not sure what's going on there.

On the non-Ruby front, it's negative in Crystal-lang too!

2147483648.times.count { |n| n } #=> -2147483648 : Int32

[naruse (Yui NARUSE)]

• Status changed from Open to Closed

Applied in changeset trunk|r63549.

---

memo->u3.cnt is long not int [Bug #14805]

[naruse (Yui NARUSE)]

• Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN to 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED

[usa (Usaku NAKAMURA)]

• Backport changed from 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED to 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED

ruby_2_4 r64125 merged revision(s) 63549,63551,63554.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED to 2.3: REQUIRED, 2.4: DONE, 2.5: DONE

ruby_2_5 r64432 merged revision(s) 63549,63551,63554.