[ruby-core:119914] [Ruby master Bug#20785] Should `a in b, and c` `a in b, or c` `a in b, rescue c` be syntax ok?

Issue #20785 has been updated by Dan0042 (Daniel DeLorme).


mame (Yusuke Endoh) wrote in #note-5:
> In terms of a newline after a comma, it should be handled as an end of a sentence.
> 
> ```ruby
> a in b, # This line should be a complete sentence
> and c   # This is an invalid line
> ```

I doubt my opinion makes any difference here, but the above makes no sense to me. I would expect this to be a valid pattern match:

```ruby
a in b,
     c,
     d 
```


----------------------------------------
Bug #20785: Should `a in b, and c` `a in b, or c` `a in b, rescue c` be syntax ok?
https://bugs.ruby-lang.org/issues/20785#change-110635

* Author: tompng (tomoya ishida)
* Status: Assigned
* Assignee: matz (Yukihiro Matsumoto)
* ruby -v: ruby 3.4.0dev (2024-10-04T03:22:53Z master 939ec9f080) +YJIT +MN +PRISM [arm64-darwin22]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
This code is accepted in parse.y but rejected in prism
~~~ruby
tap do
  a in b, and c
  a in b, or c
  a in b, rescue c
end

# parsed as
tap do
  (a in b,;) and c
  (a in b,;) or c
  a in b,;
rescue c
end
~~~

I think these should be rejected like prism (parse.y accepts)
~~~ruby
a in b, and c

a in b,
and c

tap do
  a in b, rescue c
end
~~~


I think these should be accepted like parse.y (prism rejects)
~~~ruby
tap do
  a in b,
end

tap do
  a in b,
rescue
end
~~~



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