Issue #11236 has been updated by Aleksandar Kostadinov.


Nobuyoshi Nakada wrote:
> What message would be better?

Unsupported key type?

btw what is the reason to have that limitation? Not that I need this functionality, I just happened to notice the difference...

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Bug #11236: inconsistent behavior using ** vs hash as method parameter
https://bugs.ruby-lang.org/issues/11236#change-52805

* Author: Aleksandar Kostadinov
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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Using ruby 2.2.2 I see this work:

~~~
[18] pry(main)> def test(cmd, opts={})
[18] pry(main)*   puts cmd,opts
[18] pry(main)* end  
=> :test
[19] pry(main)> test(:ads, :d => 6, :f => :gah, {a:3,b:4} => 3)
ads
{:d=>6, :f=>:gah, {:a=>3, :b=>4}=>3}
=> nil
~~~

But this fails:

~~~
[2] pry(main)> def test(cmd, **opts)
[2] pry(main)*   puts cmd, opts
[2] pry(main)* end  
[9] pry(main)> test(:ads, :d => 6, :f => :gah, {a:3,b:4} => 3)
ArgumentError: wrong number of arguments (2 for 1)
from (pry):2:in `test'
~~~



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