From: naruse@...
Date: 2021-02-02T10:08:44+00:00
Subject: [ruby-core:102381] [Ruby master Bug#17534] Pattern-matching is	broken with find pattern

Issue #17534 has been updated by naruse (Yui NARUSE).

Backport changed from 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED to 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE

ruby_3_0 2dc39e2fd45aacd5fcd33ed80f602bd6f2ddb504 merged revision(s) 1b89b99941548fdb65305dd9a412082e7fdba45a.

----------------------------------------
Bug #17534: Pattern-matching is broken with find pattern
https://bugs.ruby-lang.org/issues/17534#change-90242

* Author: zverok (Victor Shepelev)
* Status: Closed
* Priority: Normal
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE
----------------------------------------
The minimal reproduction code:

```ruby
case [1, 2, 3]
in y
  puts "branch1"
in [*, x, *]
  puts "branch2"
else
  puts "branch3"
end
```
This outputs long "raw disasm" sequence, and then
```
---------------------
break_pm.rb:6: argument stack underflow (-1)
break_pm.rb: compile error (SyntaxError)
```

```
$ ruby -v
ruby 3.1.0dev (2021-01-13T09:12:49Z master 6f6dfdcc68) [x86_64-linux]
```



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