Issue #16370 has been reported by jnchito (Junichi Ito).

----------------------------------------
Feature #16370: Pattern matching with variable assignment (the priority of `in` operator)
https://bugs.ruby-lang.org/issues/16370

* Author: jnchito (Junichi Ito)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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I wrote this code:

``` ruby
n = 0
ret = n in 99
p ret
```

I expected `ret` was `false` but was `0` (truthy value).

I had to write like this:

```ruby
n = 0
ret = (n in 99)
p ret #=> false
```

However, I would like to write `ret = n in 99` because it is more natural for me, and I am afraid many people might mistake like me. Could you reconsider the priority of `in` operator?




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