Bug #21363: `Namespace.current` should always return the Namespace in which it was defined

• Status: Closed
• Assignee: tagomoris (Satoshi Tagomori)
• Target version: -
• ruby -v: ruby 3.5.0dev (2025-05-22T23:07:21Z rm-assertion 17e71c7a24) +PRISM [arm64-darwin24]
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
• Tags: box

[tenderlovemaking (Aaron Patterson)]

I think Namespace.current should always return the namespace in which it was defined. Here is an example to demonstrate what I mean:

File.binwrite("ns.rb", <<-RUBY)
# namespace 3

module M
  def self.test
    p Namespace.current
  end

  TEST = -> {
    p Namespace.current
  }
end
RUBY

ns = Namespace.new
ns.load "./ns.rb"

p Namespace.current
ns::M.test
ns::M::TEST.call

I expect the output of ns::M.test and ns::M::TEST.call to be the same. Instead the output is like this:

#<Namespace:2,user,main>
#<Namespace:3,user,optional>
#<Namespace:2,user,main>

I think a method and lambda defined in the same namespace should return the same value for Namespace.current

[tenderlovemaking (Aaron Patterson)]

To be more specific, given this program:

File.binwrite("ns.rb", <<-RUBY)
# namespace 3

module M
  def self.test
    p test: Namespace.current
  end

  TEST = -> {
    p lambda: Namespace.current
  }
end
RUBY

ns = Namespace.new
ns.load "./ns.rb"

p main: Namespace.current
ns::M.test
ns::M::TEST.call

I expect the following output:

{main: #<Namespace:2,user,main>}
{test: #<Namespace:3,user,optional>}
{lambda: #<Namespace:3,user,optional>}

But I got the following output:

{main: #<Namespace:2,user,main>}
{test: #<Namespace:3,user,optional>}
{lambda: #<Namespace:2,user,main>}

[hsbt (Hiroshi SHIBATA)]

• Tags set to namespace

[tagomoris (Satoshi Tagomori)]

• Assignee set to tagomoris (Satoshi Tagomori)

[tagomoris (Satoshi Tagomori)]

• Status changed from Open to Closed

Now it's working as we expects:

MBA:build s-tagomori$ cat m.rb 
module M
  def self.test
    p test: Ruby::Box.current
  end

  TEST = -> {
    p lambda: Ruby::Box.current
  }
end
MBA:build s-tagomori$ RUBY_BOX=1 ./exe/ruby -e 'b = Ruby::Box.new; b.require("./m"); p main: Ruby::Box.current; b::M.test; b::M::TEST.call'
./exe/ruby: warning: Ruby::Box is experimental, and the behavior may change in the future!
See doc/language/box.md for known issues, etc.
{main: #<Namespace:2,user,main>}
{test: #<Namespace:3,user,optional>}
{lambda: #<Namespace:3,user,optional>}
MBA:build s-tagomori$ ./exe/ruby -v
ruby 4.0.0dev (2025-12-09T12:29:36Z box-news-documents.. c998717de8) +PRISM [arm64-darwin24]