From: "fxn (Xavier Noria) via ruby-core" <ruby-core@...>
Date: 2025-05-30T15:32:48+00:00
Subject: [ruby-core:122342] [Ruby Bug#21384] const_added is triggered twice when using autoload

Issue #21384 has been updated by fxn (Xavier Noria).


Let me add that I'd prefer that Ruby does not consider autoloads as constants in the API, I'd like autoloads to become constants if realized (autoloading can err, and even if succeeds, the owner may not be the receiver of the `autoload` call).

But that is the way it works.

----------------------------------------
Bug #21384: const_added is triggered twice when using autoload
https://bugs.ruby-lang.org/issues/21384#change-113489

* Author: petekinnecom (Pete Kinnecom)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
As the title says, I've noticed that `const_added` is invoked twice when using `autoload`. I'm wondering if this behavior is intended or perhaps a bug. Here's a small script to reproduce what I'm seeing:


``` ruby
require "tmpdir"

dir = Dir.mktmpdir

File.write(
  File.join(dir, "const.rb"),
  "class Const; end"
)

def Object.const_added(const_name)
  super.tap { puts "const_added: #{const_name}" }
end

$LOAD_PATH << dir

puts "before autoload call"
autoload :Const, "const"
puts "after autoload call"
puts Const

# Produces output:
#
# => before autoload call
# => const_added: Const
# => after autoload call
# => const_added: Const
# => Const
```




I'm seeing the behavior using the following docker containers ruby:3.2 and ruby:3.5-rc when running like so: `docker run -v ./:/home ruby:3.5-rc ruby /home/script.rb`. Thanks.




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