[ruby-core:70293] [Ruby trunk - Bug #11382] [Closed] Keyword arguments randomly nullified

Issue #11382 has been updated by Tomoyuki Chikanaga.

Status changed from Open to Closed

Hello, Thank you for your report.

 I think it is related to #11027 and already finxed on trunk and ruby_2_2 branch HEAD.

~~~
 $ ruby -v bug11382.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
a: "A", b: nil, others: {:cc=>"CC"}
a: "A", b: "B", others: {:c=>"C"}
$ rbenv shell 2.2.0-dev
$ ruby -v bug11382.rb
ruby 2.2.3p150 (2015-08-04 revision 51475) [x86_64-darwin14]
a: "A", b: "B", others: {:cc=>"CC"}
a: "A", b: "B", others: {:c=>"C"}
~~~ 

Could you try with ruby_2_2 HEAD? If you use rbenv and ruby-build, you can install it as 2.2.0-dev.

----------------------------------------
Bug #11382: Keyword arguments randomly nullified
https://bugs.ruby-lang.org/issues/11382#change-53717

* Author: Milovan Zogovic
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: 2.2.2
* Backport: 
----------------------------------------
Here is the example:

~~~
class Parent
  def initialize(a: nil, b: nil, **properties)
    puts("parent: { a: #{a.inspect}, b: #{b.inspect}, properties: #{properties}")
  end
end


class Child < Parent
  def initialize(args={})
    puts("child: #{args}")
    super
  end
end

require "yaml"
Child.new(a: "A", **YAML.load("---\n:b: B\n:x: X"))   # ok
Child.new(a: "A", **YAML.load("---\n:b: B\n:xx: XX")) # bug: ":a" gets nullified
~~~


The output is:

~~~
child: {:a=>"A", :b=>"B", :x=>"X"}
parent: { a: "A", b: "B", properties: {:x=>"X"}

child: {:a=>"A", :b=>"B", :xx=>"XX"}
parent: { a: "A", b: nil, properties: {:xx=>"XX"}
~~~

The only difference between first and second example is that the second one uses :xx as extra argument, while the first one uses :x. 
The bug will appear randomly based on the argument name.
Also, this only happens when  when the arguments are loaded from somewhere else (e.g. YAML.load).
If i put `{ b: "B", xx: "XX" }` just anywhere in the code, the bug won't happen, which is extra weird.

It works with ruby 2.1, and 2.0.





-- 
https://bugs.ruby-lang.org/