[ruby-core:112444] [Ruby master Bug#19439] Marshal.load doesn't load Regexp instance variables

Issue #19439 has been updated by byroot (Jean Boussier).


After a quick check, it's because the IVAR on Regexps is used to store the encoding:

```c
      case TYPE_REGEXP:
        {
            VALUE str = r_bytes(arg);
            int options = r_byte(arg);
            int has_encoding = FALSE;
            st_index_t idx = r_prepare(arg);

            if (ivp) {
                r_ivar(str, &has_encoding, arg);
                *ivp = FALSE;
            }
```

I'll dig a bit more, but it may be a fundamental limitation of the format.

----------------------------------------
Bug #19439: Marshal.load doesn't load Regexp instance variables
https://bugs.ruby-lang.org/issues/19439#change-101890

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Priority: Normal
* ruby -v: 3.1.3
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Hello, I've noticed this strange behaviour:

```ruby
source_object = Regexp.new("a")
source_object.instance_variable_set(:@foo, :bar)

regexp = Marshal.load(Marshal.dump(source_object))
regexp.instance_variables # => []
```

I would expect instance variables to be loaded



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