From: "jballanc (Joshua Ballanco)" <jballanc@...>
Date: 2013-05-12T00:12:06+09:00
Subject: [ruby-core:54913] [ruby-trunk - Feature #8377] Deprecate :: for method calls in 2.1


Issue #8377 has been updated by jballanc (Joshua Ballanco).


=begin
I'm not sure how I feel about this. I understand the potential for confusion, but at the same time there's a certain congruity of being able to inherit from classes or methods that create classes in the same way. For example:

    module Foo
      class Bar
        def say
          "Hello from Bar!"
        end
      end
    
      def self.Bar(greeting)
        klass = Class.new
        klass.class_eval <<-END
          def say
            "#{greeting} from parameterized Bar!"
          end
        END
        klass
      end
    end
    
    class Baz < Foo::Bar
      def shout
        say.upcase
      end
    end
    
    class Quux < Foo::Bar("Howdy")
      def shout
        say.upcase
      end
    end
    
    puts Baz.new.shout
    puts Quux.new.shout

If we remove the ability to call methods with (({::})), then the class definition lines don't match as nicely:

    class Baz < Foo::Bar
    ...
    class Quux < Foo.Bar("Howdy")
    ...

Though I'd be interested to hear Mr. Evans opinion, since I think Sequel is where I've seen this used to the greatest effect...
=end

----------------------------------------
Feature #8377: Deprecate :: for method calls in 2.1
https://bugs.ruby-lang.org/issues/8377#change-39252

Author: charliesome (Charlie Somerville)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: current: 2.1.0


=begin
(({::})) is usually a constant lookup operator, but it can also be used to call methods. This can confusing to people learning Ruby.

I propose deprecating (({::})) as a method call operator in Ruby 2.1, then removing it in 2.2 (or whichever version comes after 2.1).

As part of the deprecation, Ruby's parser should emit a warning whenever (({::})) is used as a method call operator. This warning should be emitted even if (({-w})) is not enabled.
=end


-- 
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