From: hanmac@...
Date: 2020-07-31T07:34:56+00:00
Subject: [ruby-core:99414] [Ruby master Bug#17093] attr_accessor works	strange

Issue #17093 has been updated by Hanmac (Hans Mackowiak).


This:

``if type.nil?
 type = 'default'
end``

is different from this:

`type = 'default' if type.nil?`

because of the lexical reading, it reads the setting of local variable first and now assumes that type is local variable in this case

----------------------------------------
Bug #17093: attr_accessor works strange
https://bugs.ruby-lang.org/issues/17093#change-86861

* Author: mpavel (pavel m)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin17]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
require 'rubygems'

class A
  def initialize(type:)
    @type = type
  end

  def b
    p type
    p type.nil?
    type = 'default' if type.nil?
    type
  end

  private

  attr_accessor :type
end

RSpec.describe A do
  let(:type) { 'whoaaa' }

  it 'return default' do
    expect(A.new(type: type).b).to eq('default')
  end

  it 'instance variable is "whoaaa"' do
    expect(A.new(type: type).instance_variable_get(:@type)).to eq(type)
  end
end

all tests green

output
A
"whoaaa"
false
  return default
  instance variable is "whoaaa"



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