[ruby-core:64427] [ruby-trunk - Bug #10142] named params don't always capture passed named args

Issue #10142 has been updated by First Last.


Koichi Sasada wrote:
> (2014/08/16 12:49), [e-mail] wrote:
>  > this example is particularly illustrative, it's absurd to complain about missing keyword b when the method is being passed keyword b
>  
>  What kind of message do you expect?
>  

I already stated what I think would make more sense:

before keyword args are packaged into a hash which is bound to a mandatory param, actual first class keyword params should get a chance to bind to/consume them

in this specific example, key arg b would be bound to key param b, and the remaining key arg c would be put into a hash which would be bound to mandatory param a

I should underscore that I first discovered this issue in a real scenario, I forgot to pass one of several mandatory args to a method (first example) and instead of raising a helpful arg error it unbound an optional key arg x from key param x and bound it to the mandatory param.

Current behavior is surprising, illogical and promotes subtle bugs.

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Bug #10142: named params don't always capture passed named args
https://bugs.ruby-lang.org/issues/10142#change-48382

* Author: First Last
* Status: Rejected
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
~~~ruby
irb(main):007:0> def foo(a, b: nil); [a, b] end
:foo
irb(main):008:0> foo b: 1
[
  [0] {
    :b => 1
  },
  [1] nil
]
~~~
______________________________

would be better if this raised



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