From: UlyssesZhan@...
Date: 2020-04-17T10:04:09+00:00
Subject: [ruby-core:97937] [Ruby master Bug#16797] Array#flatten not checking `respond_to? :to_ary`

Issue #16797 has been reported by UlyssesZhan (������ ���).

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

* Author: UlyssesZhan (������ ���)
* Status: Open
* 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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