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Bug #15834

Mutating the result of SortedSet.to_a mutates the original set, potentially violating the set's guarantees

Added by viko (Viko Viko) 7 months ago. Updated 22 days ago.

Status:
Open
Priority:
Normal
Target version:
-
ruby -v:
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
[ruby-core:92578]

Description

require 'set'

set = SortedSet[1, 2, 3]
set.to_a << -1
set.to_a << 3
set.each do |x|
  puts x
end

puts
set.add -2
set.each do |x|
  puts x
end
1
2
3
-1
3

-2
1
2
3

As can be seen, this breaks SortedSet's guarantee of ordering and Set's guarantee of uniqueness, besides being strange behaviour. Mutating the set normally undoes the changes. This bug only seems to exist for SortedSet, and not for Set itself. Workaround: dup.


Files

sorted-set-to_a-mutate-15834 (1.02 KB) sorted-set-to_a-mutate-15834 jeremyevans0 (Jeremy Evans), 10/27/2019 11:08 PM

History

Updated by marcandre (Marc-Andre Lafortune) 6 months ago

  • Assignee set to knu (Akinori MUSHA)

Updated by jeremyevans0 (Jeremy Evans) 22 days ago

Attached is a patch with a test for fixing this.

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