[ruby-core:117781] [Ruby master Bug#20472] Ractor support for ** into hash literal

6 May 2024

      Issue #20472 has been reported by kddnewton (Kevin Newton).

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Bug #20472: Ractor support for ** into hash literal
https://bugs.ruby-lang.org/issues/20472

* Author: kddnewton (Kevin Newton)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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```ruby
# shareable_constant_value: experimental_copy
a = { "foo" => "bar" }
A = { **a }
```

In this example, Ruby fails an assertion and crashes. I think we should either provide support for this, or we should explicitly provide a syntax error indicating that ** isn't allowed in constant writes when ractor pragmas are enabled.

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