Issue #9803 has been reported by _ wanabe.

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misc #9803: document of Removed C API is missing in NEWS
https://bugs.ruby-lang.org/issues/9803

* Author: _ wanabe
* Status: Open
* Priority: Normal
* Assignee: Zachary Scott
* Category: doc
* Target version: 
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I found that rb_check_safe_str() is removed in ruby-2.1 and trunk.
And I found #9502 and [CAPI\_obsolete\_definitions](https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/CAPI_obsolete_definitions) page, but these changes is not in NEWS and NEWS-2.1.0 as I see.

The changes should be written in NEWS, shouldn't they?



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