[ruby-core:80797] [Ruby trunk Bug#13485] MinGW TestEnumerable#test_callcc SEGV info

Issue #13485 has been reported by MSP-Greg (Greg L).

----------------------------------------
Bug #13485: MinGW TestEnumerable#test_callcc SEGV info
https://bugs.ruby-lang.org/issues/13485

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0dev (2017-04-18 trunk 58397) [x64-mingw32]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Re the patch needed in MinGW builds for [TestEnumerable#test_callcc](https://github.com/ruby/ruby/blob/d6873af4bdc99914f20f6184966fa840c91bdf10/test/ruby/test_enum.rb#L559-L570) (file `test/ruby/test_enum.rb`), I ran the following code with `--disable-gems`:

```ruby
require_relative '<path to ruby>/lib/ruby/2.5.0/x64-mingw32/continuation.so'

1000.times {
  c = nil
  o = Object.new
  class << o; self; end.class_eval do
    define_method(:<=>) do |x|
      callcc {|c2| c ||= c2 }
      0
    end
  end
  ary = [o,o]
  begin
    ary.sort_by {|x| x }
    c.to_s ; c.call
  rescue
  end
}
```

Attached is a file with the code and the SEGV output when running.  I removed the ruby path to shorten it.

Note that if the line -

```ruby
    c.to_s ; c.call
```
is replaced with -

```ruby
    c.call
```

my system hangs/stops.  No output, no response; have to force the command window closed...


---Files--------------------------------
TestEnumerable#call_cc_SEGV.txt (4.01 KB)


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