[ruby-core:107167] [Ruby master Feature#18408] Allow pattern match to set instance variables

Issue #18408 has been updated by palkan (Vladimir Dementyev).


Dan0042 (Daniel DeLorme) wrote in #note-13:
> @palkan Wow, thank you for blowing my mind.
> 
> However, is that behavior documented?

The examples demonstrate a hypothetical situations if we allow binding ivars.
However, we can just drop `@` and get the same behaviour for lvars. And that would lead to the undefined behavior already documented.

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Feature #18408: Allow pattern match to set instance variables
https://bugs.ruby-lang.org/issues/18408#change-96027

* Author: Dan0042 (Daniel DeLorme)
* Status: Assigned
* Priority: Normal
* Assignee: ktsj (Kazuki Tsujimoto)
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I expected this to work:

```ruby
42 => @v
```

But instead it raises "syntax error, unexpected instance variable"

Is this intentional?



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