Issue #19742 has been updated by fxn (Xavier Noria).
@ioquatix oh wait, we might have two questions in our minds.
I am like: Can a module whose `mod.name` is not `nil` be `anonymous?`. Answer is, if we
want to agree with the current docs, it cannot be, because `Module#name` has to return
`nil` for anonymous modules.
Then, I guess you had in mind the definition of `Module#anonymous?`. That needs an
"iff" indeed. However, if you have to define, then making that condition an
"iff" could not be controversial, it is the natural extension to me.
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Feature #19742: Introduce `Module#anonymous?`
https://bugs.ruby-lang.org/issues/19742#change-103658
* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
----------------------------------------
As a follow-on <from
https://bugs.ruby-lang.org/issues/19521>gt;, I'd like propose
we introduce `Module#anonymous?`.
In some situations, like logging/formatting, serialisation/deserialization, debugging or
meta-programming, we might like to know if a class is a proper constant or not.
However, this brings about some other issues which might need to be discussed.
After assigning a constant, then removing it, the internal state of Ruby still believes
that the class name is permanent, even thought it's no longer true.
e.g.
```
m = Module.new
m.anonymous? # true
M = m
m.anonyomous # false
Object.send(:remove_const, :M)
M # uninitialized constant M (NameError)
m.anonymous? # false
```
Because RCLASS data structure is not updated after the constant is removed, internally the
state still has a "permanent class name".
I want to use this proposal to discuss this issue and whether there is anything we should
do about such behaviour (or even if it's desirable).
Proposed PR:
https://github.com/ruby/ruby/pull/7966
cc @fxn
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