[ruby-core:115991] [Ruby master Bug#20111] `defined?` returns `expression` for assignment operators combined with fully qualified constants

Issue #20111 has been reported by andrykonchin (Andrew Konchin).

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Bug #20111: `defined?` returns `expression` for assignment operators combined with fully qualified constants
https://bugs.ruby-lang.org/issues/20111

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Priority: Normal
* ruby -v: 3.2.2
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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`defined?` doesn't consider &&=, ||= and other ...= operators as `assignment`:

```ruby
defined?(A::B += 1) # => "expression"
defined?(A::B &&= true) # => "expression"
defined?(A::B ||= true) # => "expression"
```

But consider as `assignment` ordinal assignment:

```ruby
defined?(A::B = 1) # => "assignment"
```

Wondering if it's expected behaviour.



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