From: "okuramasafumi (Masafumi OKURA) via ruby-core" <ruby-core@...>
Date: 2023-04-26T17:37:16+00:00
Subject: [ruby-core:113353] [Ruby master Bug#19619] Endless method definition with parameters for an instance given as numbered parameters doesn't work

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


The result of the last code:

```
undefined method `bar' for #<Object:0x0000000108e20438> (NoMethodError)
```

----------------------------------------
Bug #19619: Endless method definition with parameters for an instance given as numbered parameters doesn't work
https://bugs.ruby-lang.org/issues/19619#change-102913

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