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Bug #15441
closedundefined method `union' and `difference' in Ruby 2.6
Description
Using irb
with using current Ruby trunk version:
irb(main):008:0> RUBY_VERSION
=> "2.6.0"
irb(main):009:0> [1,3,5,7,9].union([2,3,4,5,6])
Traceback (most recent call last):
2: from /usr/local/bin/irb:11:in `<main>'
1: from (irb):9
NoMethodError (undefined method `union' for [1, 3, 5, 7, 9]:Array)
irb(main):002:0> [1,2,3,4].difference([1,2])
Traceback (most recent call last):
2: from /usr/local/bin/irb:11:in `<main>'
1: from (irb):2
NoMethodError (undefined method `difference' for [1, 2, 3, 4]:Array)
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