Issue #9977 has been reported by Nobuyoshi Nakada.

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Bug #9977: memory leak at ENV.[]= on Windows
https://bugs.ruby-lang.org/issues/9977

* Author: Nobuyoshi Nakada
* Status: Open
* Priority: Normal
* Assignee: cruby-windows
* Category: core
* Target version: current: 2.2.0
* ruby -v: trunk
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED
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Windows版で、`ENV.[]=` がメモリリークしているようです。



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