[ruby-core:109113] [Ruby master Bug#18890] parse.y: pattern label is newline-sensitive if it is dynamic

Issue #18890 has been reported by qnighy (Masaki Hara).

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Bug #18890: parse.y: pattern label is newline-sensitive if it is dynamic
https://bugs.ruby-lang.org/issues/18890

* Author: qnighy (Masaki Hara)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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The two patterns in the code below behave differently:

```ruby
def f(obj)
  case obj
  in foo:
    0
    true
  in "bar":
    0
    true
  else
    false
  end
end

p f({ foo: 42 }) # => true
p f({ bar: 42 }) # => false
```

which does not seem an intended behavior.



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