From: aaronc20000@gmail.com
To: ruby-core@ruby-lang.org
Subject: [ruby-core:96508] [Ruby master Feature#16456] Ruby 2.7 argument delegation (...) should be its own kind of parameter in Method#parameters
Date: Fri, 27 Dec 2019 00:42:16 +0000 (UTC) [thread overview]
Message-ID: <redmine.issue-16456.20191227004215.0eda6e1023e83d6d@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-16456.20191227004215@ruby-lang.org
Issue #16456 has been reported by aaronc81 (Aaron Christiansen).
----------------------------------------
Feature #16456: Ruby 2.7 argument delegation (...) should be its own kind of parameter in Method#parameters
https://bugs.ruby-lang.org/issues/16456
* Author: aaronc81 (Aaron Christiansen)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
----------------------------------------
A method defined with `...` as its parameter list is equivalent to one defined with `*args, &blk`, according to `Method#parameters`.
```
def foo(...); end
p method(:foo).parameters
# => [[:rest, :*], [:block, :&]]
```
Even in Ruby 2.7, `...` and `*args, &blk` are not _quite_ equivalent as the latter may produce a warning where the former does not. In Ruby 3.0 and beyond, `...` and `*args, &blk` will have a substantial semantic difference. Due to this, I don't consider the current behaviour of `Method#parameters` particularly ideal when dealing with methods using this new syntax.
If the goal of `...` is to be a "delegate everything" operator, even when parameter passing is changed like in Ruby 3.0, I would propose that `Method#parameters` considers it a unique type of parameter. For example:
```
def foo(...); end
p method(:foo).parameters
# => [[:delegate, :"..."]]
```
--
https://bugs.ruby-lang.org/
next parent reply other threads:[~2019-12-27 0:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-16456.20191227004215@ruby-lang.org>
2019-12-27 0:42 ` aaronc20000 [this message]
2019-12-27 11:29 ` [ruby-core:96511] [Ruby master Feature#16456] Ruby 2.7 argument delegation (...) should be its own kind of parameter in Method#parameters eregontp
2019-12-27 11:37 ` [ruby-core:96513] " zverok.offline
2019-12-27 17:35 ` [ruby-core:96517] " aaronc20000
2019-12-29 22:54 ` [ruby-core:96585] " daniel
2019-12-31 17:30 ` [ruby-core:96608] " aaronc20000
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