From: alxtskrnk@...
Date: 2015-07-27T20:52:56+00:00
Subject: [ruby-core:70137] [Ruby trunk - Bug #11048] blocks raise on missing and extra keyword args

Issue #11048 has been updated by bug hit.


another use case for this is hash destructuring

```
array_of_hashes.each do |key1:, key2:|
end
```

it would be much better if this code did not raise on extra or missing keys, otherwise this type of destructuring is almost completely impractical

----------------------------------------
Bug #11048: blocks raise on missing and extra keyword args
https://bugs.ruby-lang.org/issues/11048#change-53568

* Author: bug hit
* Status: Rejected
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* ruby -v: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
blocks intentionally tolerate arity mismatches

```
irb(main):001:0> proc{|a, b| [a, b]}.(1)
[
  [0] 1,
  [1] nil
]

irb(main):003:0> proc{|a, b|[a, b]}.(1, 2, 3)
[
  [0] 1,
  [1] 2
]


```

so why not missing keyword args?

```
irb(main):002:0> proc{|a:, b:|[a, b]}.(a: 1)
ArgumentError: missing keyword: b


irb(main):004:0> proc{|a:, b:|[a, b]}.(a: 1, b: 1, c: 1)
ArgumentError: unknown keyword: c

```




-- 
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