Issue #16344 has been reported by osyo (manga osyo).

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Bug #16344: Can be assigned to numbered parameter when after used _1
https://bugs.ruby-lang.org/issues/16344

* Author: osyo (manga osyo)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-11-11T23:39:38Z trunk 2407e89725) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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## Expected behavior

```ruby
_1 = :local_variable
proc {
  _1
  # Error: Can't assign to numbered parameter _1
  _1 = 42
}
```


## Actual behavior

```ruby
_1 = :local_variable
proc {
  _1
  # No error
  _1 = 42
}
```

Cannot be assinged to numbered parameter from #16293.
However, can be assinged to numbered parameter if defined local variable _1 outside block.
I think this is a bug.







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