From: "fxn (Xavier Noria) via ruby-core" <ruby-core@...>
Date: 2024-01-19T13:16:39+00:00
Subject: [ruby-core:116330] [Ruby master Bug#20188] `Module#const_source_location` returns wrong information when real constant was defined but autoload is still ongoing

Issue #20188 has been updated by fxn (Xavier Noria).


Are you guys sure `defined?` depends on the thread? In this test running in 3.3 I don't seem to reproduce:

```ruby
$up = Queue.new
$down = Queue.new

File.write('/tmp/bar.rb', <<~RUBY)
  Bar = 1

  $up << true
  $down.pop

  p defined?(Bar)
RUBY

autoload :Bar, '/tmp/bar.rb'

t = Thread.new { Bar }

$up.pop
p defined?(Bar)

$down << true
t.join
```

I get two "constant"s printed.

----------------------------------------
Bug #20188: `Module#const_source_location` returns wrong information when real constant was defined but autoload is still ongoing
https://bugs.ruby-lang.org/issues/20188#change-106356

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Ref: https://github.com/fxn/zeitwerk/issues/281

`const_source_location` keeps returning the location of the `autoload` call, even after the real constant was defined. It only starts returning the real constant location once the autoload was fully completed.

```ruby
# /tmp/autoload.rb
File.write("/tmp/const.rb", <<~RUBY)
module Const
  LOCATION = Object.const_source_location(:Const)
end
RUBY

autoload :Const, "/tmp/const"

p Const::LOCATION
```

Expected Output:

```ruby
["/tmp/const.rb", 1]
```

Actual Output:

```ruby
["/tmp/autoload.rb", 8]
```

Potential patch: https://github.com/ruby/ruby/pull/9549



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