[ruby-core:78289] [Ruby trunk Bug#12974] Marshal.dump dumps core.

Issue #12974 has been reported by Shyouhei Urabe.

----------------------------------------
Bug #12974: Marshal.dump dumps core.
https://bugs.ruby-lang.org/issues/12974

* Author: Shyouhei Urabe
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.4.0dev (2016-11-24 trunk 56892) [x86_64-darwin15]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
```ruby
Hash.include Module.new {
  def marshal_dump
    dup
  end

  def marshal_load this
    initialize_copy this
  end
}

p Marshal.load(Marshal.dump(foo:"bar"))
```

This script dumps core.



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