From: zverok.offline@...
Date: 2021-01-13T14:46:35+00:00
Subject: [ruby-core:102061] [Ruby master Bug#17534] Pattern-matching is	broken with find pattern

Issue #17534 has been reported by zverok (Victor Shepelev).

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

* Author: zverok (Victor Shepelev)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
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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