From: "nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@...>
Date: 2024-04-12T07:30:07+00:00
Subject: [ruby-core:117502] [Ruby master Bug#20423] Anonymous block forwarding shouldn't work with ... but it does

Issue #20423 has been updated by nobu (Nobuyoshi Nakada).


https://github.com/ruby/ruby/pull/10514

----------------------------------------
Bug #20423: Anonymous block forwarding shouldn't work with ... but it does
https://bugs.ruby-lang.org/issues/20423#change-107889

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
According to [this note](https://bugs.ruby-lang.org/issues/11256#note-16), anonymous block forwarding should only be supported when explicitly used in the method signature.

For example:

```ruby
def foo(&) = bar(&) # OK
def foo = bar(&)    # NG
```

However, if you use `...` in the method signature, `&` seems to work:

```ruby
def foo(...)
  # bar(*) # Syntax Error
  # bar(**) # Syntax Error
  bar(&) # not a syntax error, but I think it should be
end
```

I think this should be a syntax error.



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