From: takashikkbn@...
Date: 2020-02-19T07:26:36+00:00
Subject: [ruby-core:97200] [Ruby master Bug#16641] Backport request: MJIT crashes on a certain flow of branches

Issue #16641 has been reported by k0kubun (Takashi Kokubun).

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Bug #16641: Backport request: MJIT crashes on a certain flow of branches
https://bugs.ruby-lang.org/issues/16641

* Author: k0kubun (Takashi Kokubun)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]
* Backport: 2.5: DONTNEED, 2.6: REQUIRED, 2.7: REQUIRED
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## Problem
~~~ruby
def a(b)
  ".#{b unless b == 1}" if true
end

print(a(0))
~~~


This script `test.rb` crashes by `ruby --disable-gems --jit-verbose=1 --jit-min-calls=1 --jit-wait test.rb`.

## Patch
I fixed this in commit:c4794ed73ad348a61a7cfbe3da0a7eb49ba46eb9, which needs to be backported to 2.6 and 2.7.



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