From: kimmo.lehto@...
Date: 2019-08-08T08:56:42+00:00
Subject: [ruby-core:94195] [Ruby master Bug#16086] OpenStruct method access with a block does not raise

Issue #16086 has been reported by kke (Kimmo Lehto).

----------------------------------------
Bug #16086: OpenStruct method access with a block does not raise
https://bugs.ruby-lang.org/issues/16086

* Author: kke (Kimmo Lehto)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
This can cause confusion.

```ruby
  > OpenStruct.new(hello: 'world').each { |k, v| puts k.upcase } # there's no "each" method
  => nil
  > OpenStruct.new(hello: 'world').eahc_pair { |k, v| puts k.upcase } # each_pair typo
  => nil
  ```

An undefined key with a block should maybe raise `NoMethodError` or `ArgumentError`?

A defined key with a block seems to yield the value, I don't see this being documented:

```ruby
  > OpenStruct.new(hello: 'world').hello { |k| puts k.upcase } 
  HELLO
```

Maybe it should raise `ArgumentError` too?

Related: https://bugs.ruby-lang.org/issues/15515




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