From: shevegen@...
Date: 2018-12-20T15:17:43+00:00
Subject: [ruby-core:90647] [Ruby trunk Bug#15441] undefined method `union' and `difference' in Ruby 2.6

Issue #15441 has been updated by shevegen (Robert A. Heiler).


"ruby -v" probably provides more information than the in-ruby
constant RUBY_VERSION alone does.

----------------------------------------
Bug #15441: undefined method `union' and `difference' in Ruby 2.6
https://bugs.ruby-lang.org/issues/15441#change-75813

* Author: ana06 (Ana Maria Martinez Gomez)
* Status: Rejected
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
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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