[ruby-core:101523] [Ruby master Feature#17397] `shareable_constant_value: literal` should check at runtime, not at parse time

Issue #17397 has been updated by marcandre (Marc-Andre Lafortune).


Great, thank you for the update.

One last concern with `experimental_everything`/`experimental_shareable` is for Ruby 3.1... If no longer experimental, we then accept `everything`. But if someone want to write code also compatible with Ruby 3.0, they still have to use `experimental_everything` (assuming Ruby 3.1 also allow it). And in Ruby 3.2 same thing.

Only in ~3 years can people start writing `everything` (assuming they want to be compatible with non-EOL rubies).

Could be use `everything` (or my favorite: `all`) and either warn (once) that it is experimental, or document it?

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Feature #17397: `shareable_constant_value: literal` should check at runtime, not at parse time
https://bugs.ruby-lang.org/issues/17397#change-89308

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
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I think `shareable_constant_value: literal` is too strict because it has too crude checks at parse time.

I wish the following code would parse and run:

```ruby
# shareable_constant_value: literal

class Foo < RuntimeError
end

# Similar code, but does not parse:
Bar = Class.new(RuntimeError) # => unshareable expression

Baz = Ractor.make_shareable(anything_here) # => unshareable expression

Qux = Set[1, 2, 3].freeze # => unshareable expression
```

Could we instead raise some sort of RuntimeError when an assignment is made that is not shareable?



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