Issue #12793 has been reported by Kazuhiro NISHIYAMA.

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Bug #12793: Warning.warn with non-string object
https://bugs.ruby-lang.org/issues/12793

* Author: Kazuhiro NISHIYAMA
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.4.0dev (2016-09-27 trunk 56273) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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`Warning.warn` with non-string argument causes SEGV.
For example, `Warning.warn nil`.



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