Issue #13484 has been reported by rhenium (Kazuki Yamaguchi).

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Bug #13484: Please backport r54575 ("tkutil.c: ary can be nil") to 2.3
https://bugs.ruby-lang.org/issues/13484

* Author: rhenium (Kazuki Yamaguchi)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: DONTNEED, 2.3: REQUIRED, 2.4: DONTNEED
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r54575 fixes a bug in ext/tk of Ruby 2.3, which was introduced by r53077.

Reference:
https://github.com/ruby/tk/pull/8
http://stackoverflow.com/questions/43011258/ruby-tks-canvas-and-shapes-are-bugging-out/43476737



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