Issue #9771 has been reported by Nobuyoshi Nakada.

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Bug #9771: SYM2ID(Qnil)
https://bugs.ruby-lang.org/issues/9771

* Author: Nobuyoshi Nakada
* Status: Open
* Priority: Normal
* Assignee: 
* Category: ext
* Target version: current: 2.2.0
* ruby -v: 1.9.3 or later
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED
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`ext/openssl/ossl_asn1.c:ossl_asn1_initialize()` allows `Qnil` as `tagging` since r31699.
But `SYM2ID()` is defined for T_SYMBOL values only.




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