From: Anthony Crumley <anthony.crumley@...>
Date: 2015-01-24T04:47:32+00:00
Subject: [ruby-core:67785] Change in hash key values between 2.1 and 2.2

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This RubySpec specification reveals a difference between how 2.1 and 2.2
handles ** applied to a variable in a hash.  The 2.2 behavior seems to be
more consistent but was this change a regression or was it intentional?

https://github.com/anthonycrumley/rubyspec/blob/master/language/hash_spec.rb#L92-L97

Hash literal calls #to_hash to convert an '**obj' element FAILED
Expected {:a=>2, :b=>3, :c=>3}
 to equal {:a=>1, :b=>3, :c=>3}

/vagrant/spec/rubyspec/language/hash_spec.rb:96:in `block (2 levels) in
<top (required)>'
/vagrant/spec/rubyspec/language/hash_spec.rb:3:in `<top (required)>'

Below are examples of the same behavior in irb.

2.1.5 :001 > h = {a: 1}
 => {:a=>1}
2.1.5 :002 > {a: 2, **h}
 => {:a=>2}
2.1.5 :003 > {a: 2, **h, a: 3}
 => {:a=>3}
2.1.5 :004 > {**h, a: 3}
 => {:a=>3}
2.1.5 :005 > {a: 2, a: 3}
 => {:a=>3}

2.2.0 :001 > h = {a: 1}
 => {:a=>1}
2.2.0 :002 > {a: 2, **h}
 => {:a=>1}
2.2.0 :003 > {a: 2, **h, a: 3}
 => {:a=>3}
2.2.0 :004 > {**h, a: 3}
 => {:a=>3}
2.2.0 :005 > {a: 2, a: 3}
(irb):1: warning: duplicated key at line 1 ignored: :a
 => {:a=>3}

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<div><div>This RubySpec specification reveals a difference between how 2.1 =
and 2.2 handles ** applied to a variable in a hash.=C2=A0 The 2.2 behavior =
seems to be more consistent but was this change a regression or was it inte=
ntional?</div><div><br></div><div><a href=3D"https://github.com/anthonycrum=
ley/rubyspec/blob/master/language/hash_spec.rb#L92-L97">https://github.com/=
anthonycrumley/rubyspec/blob/master/language/hash_spec.rb#L92-L97</a><br></=
div><div><div><br></div><div>Hash literal calls #to_hash to convert an &#39=
;**obj&#39; element FAILED</div><div>Expected {:a=3D&gt;2, :b=3D&gt;3, :c=
=3D&gt;3}</div><div>=C2=A0to equal {:a=3D&gt;1, :b=3D&gt;3, :c=3D&gt;3}</di=
v><div><br></div><div>/vagrant/spec/rubyspec/language/hash_spec.rb:96:in `b=
lock (2 levels) in &lt;top (required)&gt;&#39;</div><div>/vagrant/spec/ruby=
spec/language/hash_spec.rb:3:in `&lt;top (required)&gt;&#39;</div></div><di=
v><br></div><div>Below are examples of the same behavior in irb.</div><div>=
<br></div><div>2.1.5 :001 &gt; h =3D {a: 1}</div><div>=C2=A0=3D&gt; {:a=3D&=
gt;1}=C2=A0</div><div>2.1.5 :002 &gt; {a: 2, **h}</div><div>=C2=A0=3D&gt; {=
:a=3D&gt;2}=C2=A0</div><div>2.1.5 :003 &gt; {a: 2, **h, a: 3}</div><div>=C2=
=A0=3D&gt; {:a=3D&gt;3}=C2=A0</div><div>2.1.5 :004 &gt; {**h, a: 3}</div><d=
iv>=C2=A0=3D&gt; {:a=3D&gt;3}=C2=A0</div></div><div><div>2.1.5 :005 &gt; {a=
: 2, a: 3}</div><div>=C2=A0=3D&gt; {:a=3D&gt;3}=C2=A0</div></div><div><br><=
/div><div>2.2.0 :001 &gt; h =3D {a: 1}</div><div>=C2=A0=3D&gt; {:a=3D&gt;1}=
=C2=A0</div><div>2.2.0 :002 &gt; {a: 2, **h}<br></div><div>=C2=A0=3D&gt; {:=
a=3D&gt;1}=C2=A0</div><div>2.2.0 :003 &gt; {a: 2, **h, a: 3}</div><div>=C2=
=A0=3D&gt; {:a=3D&gt;3}=C2=A0</div><div>2.2.0 :004 &gt; {**h, a: 3}</div><d=
iv>=C2=A0=3D&gt; {:a=3D&gt;3}=C2=A0</div><div><div>2.2.0 :005 &gt; {a: 2, a=
: 3}</div><div>(irb):1: warning: duplicated key at line 1 ignored: :a</div>=
<div>=C2=A0=3D&gt; {:a=3D&gt;3}=C2=A0</div></div><div><br></div>

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