Issue #13054 has been updated by Usaku NAKAMURA.

Backport changed from 2.1: UNKNOWN, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: UNKNOWN, 2.2: DONE, 2.3: REQUIRED

ruby_2_2 r57221 merged revision(s) 57123.

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Bug #13054: MatchData segfaults if RMatch::regexp is nil
https://bugs.ruby-lang.org/issues/13054#change-62279

* Author: Kazuki Yamaguchi
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: DONE, 2.3: REQUIRED
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[Bug #10877] and [Bug #13042] didn't fix all of the issues.

The following four examples cause segfault for me:

~~~ruby
"abc".sub("a", ""); $~.hash
"abc".sub("a", ""); $~.names
"abc".sub("a", ""); $~.named_captures
"abc".sub("a", ""); m=$~; m.regexp; "abc".sub("a", ""); $~ == m
~~~



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