From: shyouhei@...
Date: 2016-12-21T14:22:31+00:00
Subject: [ruby-core:78779] [Ruby trunk Feature#12861] super in a block can be either lexically or dynamically scoped depending on how the block is invoked

Issue #12861 has been updated by Shyouhei Urabe.


We looked at this issue at today's developer meeting.

I think attendees had an assumption that changing behavour of `super` is too drastic.  This feature (if added) should be called something new.  So there are rooms for dynamic_super.  For lexical one, I like the idea.  But Matz was wondering if such lexically-scoped super would actually get used.

----------------------------------------
Feature #12861: super in a block can be either lexically or dynamically scoped depending on how the block is invoked
https://bugs.ruby-lang.org/issues/12861#change-62181

* Author: bug hit
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Target version: 
----------------------------------------
```ruby
class Class1
  def self.foo
    'foo'
  end
  def self.method1
    'method1'
  end
end

class Class2 < Class1
  def self.foo
    bar do
      super()
    end
  end
  def self.bar(&block)
    a = block.()
    define_singleton_method :method1, &block
    b = send(:method1)
    c = block.()
    [a, b, c]
  end
end

p Class2.foo # ["foo", "method1", "foo"]
```

It doesn't seem like a good idea for a given language construct to be either lexically or dynamically scoped, depending on how its surrounding block is invoked (which is not visible at the point of definition).  I think it would be better if super were always lexically scoped, and a different keyword (dynamic_super) were always dynamically scoped



-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>