[ruby-core:113352] [Ruby master Bug#19619] Endless method definition with parameters for an instance given as numbered parameters doesn't work

Issue #19619 has been reported by okuramasafumi (Masafumi OKURA).

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Bug #19619: Endless method definition with parameters for an instance given as numbered parameters doesn't work
https://bugs.ruby-lang.org/issues/19619

* Author: okuramasafumi (Masafumi OKURA)
* Status: Open
* Priority: Normal
* ruby -v: 3.2.2
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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This works:

```ruby
class Foo
  def bar(baz) = 'foo'
end

p Foo.new.bar('baz')
```

This also works:

```ruby
o = Object.new
o.tap { |obj| def obj.bar(baz) = 'foo' }
p o.bar('baz')
```

Even this works:

```ruby
o = Object.new
o.tap { def _1.bar = 'foo' }
p o.bar
```

But this DOESN'T work:

```ruby
o = Object.new
o.tap { def _1.bar(baz) = 'foo' }
p o.bar('baz')
```

So, when we define a method with parameters on an instance given as numbered parameters, it doesn't work. If we change one condition (definition way, parameter existence, and so on), it works.



-- 
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