From: nobu@...
Date: 2020-04-18T09:05:50+00:00
Subject: [ruby-core:97948] [Ruby master Bug#16797] Array#flatten not checking `respond_to? :to_ary`

Issue #16797 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Open to Rejected

Read the error message.

```
-:4:in `flatten': can't convert Object to Array (Object#to_ary gives Object) (TypeError)
```


----------------------------------------
Bug #16797: Array#flatten not checking `respond_to? :to_ary`
https://bugs.ruby-lang.org/issues/16797#change-85172

* Author: UlyssesZhan (������ ���)
* Status: Rejected
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
```ruby
def (a = Object.new).method_missing(...)
  Object.new
end
[a].flatten # TypeError
```
It should check whether an object responds to `to_ary` before trying to convert it into an array.



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