From: mr.krasavtsev@...
Date: 2016-07-07T20:04:55+00:00
Subject: [ruby-core:76303] [Ruby trunk Bug#12569] There is no any warnings or errors with wrong comma after last attr_accessor attribute

Issue #12569 has been reported by Roman Krasavtsev.

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Bug #12569: There is no any warnings or errors with wrong comma after last attr_accessor attribute
https://bugs.ruby-lang.org/issues/12569

* Author: Roman Krasavtsev
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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In second sample we don't have any warnings or errors with wrong comma after last  attr_accessor attribute and without it is very difficult to identify the typo. initialize method does not performed.

**It works**
class Solution
  attr_accessor :one, :two, :three

  def initialize
    @one = @two = @three = []
    puts "Done!"
  end
end

solution = Solution.new
p solution.one
p solution.two
p solution.three

**Result:**
MacBook-Air-Roman% ruby ruby_solution.rb
Done!
[]
[]
[]

**it does not work**
class Solution
  attr_accessor :one, :two, :three,

  def initialize
    @one = @two = @three = []
    puts "Done!"
  end
end

solution = Solution.new
p solution.one
p solution.two
p solution.three

**Result**
MacBook-Air-Roman% ruby ruby_solution.rb
nil
nil
nil




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