[ruby-core:120712] [Ruby master Bug#21043] Prism defined? has slight deviations from parse.y

Issue #21043 has been reported by kddnewton (Kevin Newton).

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Bug #21043: Prism defined? has slight deviations from parse.y
https://bugs.ruby-lang.org/issues/21043

* Author: kddnewton (Kevin Newton)
* Status: Open
* Assignee: prism
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: REQUIRED
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```ruby
defined?((alias foo bar))
defined?((undef foo))
def foo(*) = defined?(foo(*))
def foo(**) = defined?(foo(**))
def foo(...) = defined?(foo(...))
def foo(&) = defined?(foo(&))
```

and a couple others have slightly different behavior.



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