From: "matz (Yukihiro Matsumoto) via ruby-core" <ruby-core@...>
Date: 2025-06-05T04:24:24+00:00
Subject: [ruby-core:122419] [Ruby Feature#21335] Namespaces should be present in the backtrace

Issue #21335 has been updated by matz (Yukihiro Matsumoto).


I'd like to keep this issue pending until we provide high level API (maybe Package). See #21385)

Matz.


----------------------------------------
Feature #21335: Namespaces should be present in the backtrace
https://bugs.ruby-lang.org/issues/21335#change-113599

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
----------------------------------------
Namespaces can call in to other name spaces. I think it might be helpful if namespace information is in the backtrace.

For example:

```ruby
File.binwrite "foo.rb", <<-eorb
class Foo
  def self.test(ns1, ns2, count)
    if count == 0
      puts caller
    else
      if count % 2 == 0
        ns1::Foo.test(ns1, ns2, count - 1)
      else
        ns2::Foo.test(ns1, ns2, count - 1)
      end
    end
  end
end
eorb

ns1 = Namespace.new
ns1.load "foo.rb"

ns2 = Namespace.new
ns2.load "foo.rb"

ns1::Foo.test(ns1, ns2, 10)
```

The output is like this:

```
See doc/namespace.md for known issues, etc.
/Users/aaron/git/ruby/exe/ruby: warning: Namespace is experimental, and the behavior may change in the future!
See doc/namespace.md for known issues, etc.
/Users/aaron/git/ruby/foo.rb:9:in 'test'
/Users/aaron/git/ruby/foo.rb:7:in 'test'
/Users/aaron/git/ruby/foo.rb:9:in 'test'
/Users/aaron/git/ruby/foo.rb:7:in 'test'
/Users/aaron/git/ruby/foo.rb:9:in 'test'
/Users/aaron/git/ruby/foo.rb:7:in 'test'
/Users/aaron/git/ruby/foo.rb:9:in 'test'
/Users/aaron/git/ruby/foo.rb:7:in 'test'
/Users/aaron/git/ruby/foo.rb:9:in 'test'
/Users/aaron/git/ruby/foo.rb:7:in 'test'
./test.rb:23:in '<main>'
```

`Foo.test` alternates between namespaces when calling a method, but you can't tell from the backtrace.  I think we should include namespaces in the backtrace.



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