Issue #15920 has been reported by kachick (Kenichi Kamiya).

----------------------------------------
Bug #15920: Check frozen state of ENV
https://bugs.ruby-lang.org/issues/15920

* Author: kachick (Kenichi Kamiya)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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github: https://github.com/ruby/ruby/pull/2234

Is this an intentional behavior?

``` ruby
ENV.freeze
ENV.clear #=> No exception happen
```

raising FronzenError sounds reasonable to me




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