[ruby-core:119223] [Ruby master Bug#20748] Issue with defined? given method call with block in prism compiler

["kddnewton (Kevin Newton) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20748 has been updated by kddnewton (Kevin Newton).

Assignee set to kddnewton (Kevin Newton)

I have opened a PR for this to match the behavior exactly, but I will say I think Prism's behavior is actually correct here. Right now compile.c results in:

```ruby
puts defined?(undefined_method(){}) # => "expression"
puts defined?(undefined_method(&b)) # => ""
```

whereas Prism results in:

```ruby
puts defined?(undefined_method(){}) # => ""
puts defined?(undefined_method(&b)) # => ""
```

I have updated the code to match compile.c, but I think it's incorrect that we are falling back to "expression" because it has an explicit block versus an implicit one.

----------------------------------------
Bug #20748: Issue with defined? given method call with block in prism compiler
https://bugs.ruby-lang.org/issues/20748#change-109801

* Author: luke-gru (Luke Gruber)
* Status: Open
* Assignee: kddnewton (Kevin Newton)
* ruby -v: 3.4.0dev
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
test.rb
```ruby
puts defined?(undefined_method(){})
```

```
./ruby --parser=parse.y -I../ruby/lib -I. -I.ext/x86_64-linux -I.ext/common -r./x86_64-linux-fake ../ruby/test.rb
expression
```

```
./ruby --parser=prism -I../ruby/lib -I. -I.ext/x86_64-linux -I.ext/common -r./x86_64-linux-fake ../ruby/test.rb
# empty line
```



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