Issue #11544 has been reported by Osamu Yamauchi.

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Bug #11544: ArgumentError: Enumerable#to_set(klass, *args, &block) if specify *args.
https://bugs.ruby-lang.org/issues/11544

* Author: Osamu Yamauchi
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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---
require "set"

[2,5,4,3,2,1,3].to_set(Set, 6, 7, 8) #=> ArgumentError
---

[Actual]
/Users/torifuku/.rbenv/versions/2.2.3/lib/ruby/2.2.0/set.rb:80:in `initialize': wrong number of arguments (4 for 0..1) (ArgumentError)
	from /Users/torifuku/.rbenv/versions/2.2.3/lib/ruby/2.2.0/set.rb:691:in `new'
	from /Users/torifuku/.rbenv/versions/2.2.3/lib/ruby/2.2.0/set.rb:691:in `to_set'
	from report.rb:3:in `<main>'

[Expected]
ArgumentError should not occur.
Set instance has 1, 2, 3, 4, 5, 6, 7, 8.
Because the below document is written about *args.
http://ruby-doc.org/stdlib-2.2.3/libdoc/set/rdoc/Enumerable.html
to_set(klass = Set, *args, &block)

[Consideration]
extract from lib/set.rb
---
class Set
  def initialize(enum = nil, &block) # no *args
    ...
  end
end

module Enumerable
  def to_set(klass = Set, *args, &block)
    klass.new(self, *args, &block)
  end
end
---

I propose this patch.


---Files--------------------------------
0001-lib-set.rb-use-args-of-Enumerable-to_set-Set-to_set.patch (3.17 KB)


-- 
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