[ruby-core:114239] [Ruby master Feature#19775] Use the callback `main::const_added`

Issue #19775 has been updated by mame (Yusuke Endoh).

Status changed from Open to Closed

Since top-level constants are defined under Object, their definition can be hooked by defining `Object.const_added`.

```ruby
def Object.const_added(name)
  p name
end

Foo = 1 #=> :Foo
```


----------------------------------------
Feature #19775: Use the callback `main::const_added`
https://bugs.ruby-lang.org/issues/19775#change-103925

* Author: UlyssesZhan (Ulysses Zhan)
* Status: Closed
* Priority: Normal
----------------------------------------
In #17881, it was accepted that `Module#const_added` is called when there is a new constant added to the namespace of the module.
Since `main` can also serve as a namespace, it should also be able to use this callback.

```ruby
def const_added name
  p name
end
Foo = 1 # => :Foo
```



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