Issue #11048 has been updated by Yukihiro Matsumoto.

Status changed from Open to Closed

OK, you value consistency, where I value pragratic trade-off. That's the difference in view points.
Let's agree to disagree.

Matz.


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Bug #11048: blocks raise on missing and extra keyword args
https://bugs.ruby-lang.org/issues/11048#change-52924

* Author: bug hit
* Status: Closed
* 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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