[ruby-core:107863] [Ruby master Bug#18624] `const_source_location` returns [false, 0] when autoload is defined for the constant

Issue #18624 has been updated by ufuk (Ufuk Kayserilioglu).


This is a duplicate of Issue #17354 and @jeremyevans0, in that issue, you had argued that just because the autoload location was known didn't mean that the constant would be guaranteed to be defined by that file.

I believe this was also discussed in the Dev Meeting at the time and a consensus wasn't reached: https://bugs.ruby-lang.org/issues/17354#note-12

I suggest we close this issue and continue the conversation on #17354

----------------------------------------
Bug #18624: `const_source_location` returns [false, 0] when autoload is defined for the constant
https://bugs.ruby-lang.org/issues/18624#change-96804

* Author: pocke (Masataka Kuwabara)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0dev (2022-03-11T08:38:13Z master 2e4516be26) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
`const_source_location` returns `[false, 0]` unexpectedly with the following code.


```ruby
# test.rb
path = File.join(__dir__, 'test2')
Object.autoload 'Test2', path
require path

p Object.const_source_location 'Test2'
```

```ruby
# test2.rb
class Test2
end
```

```bash
$ ruby -v test.rb
ruby 3.2.0dev (2022-03-11T08:38:13Z master 2e4516be26) [x86_64-linux]
[false, 0]
```


I expect it returns `['/path/to/test2.rb', 2]`, but it doesn't.
Ruby 2.7 ~ 3.1 have the same behavior.


I actually encountered this problem in a Rails app with Zeitwerk. The following codes are a reproducing example with Zeitwerk.
`loader.setup` calls `autoload`, so it causes the same problem.

```ruby
# test.rb
require "zeitwerk"
loader = Zeitwerk::Loader.for_gem
loader.setup

require File.join(__dir__, 'test2')

p Zeitwerk::VERSION
p Object.const_source_location 'Test2'
```

```ruby
# test2.rb
class Test2
end
```



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