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187b8fdb69
When setjmp/longjmp/exceptions are used on Windows it's necessary to store+restore additional information from the TEB.
I didn't find any official documentation about the values to be saved, but found the corresponding boost/context implemenataion:
abf8e04e23
This is similar to the special TIB handling on x86/x86_64 on Windows.
Without this fix an exception in a fiber segfaults without any output:
ruby -e "Fiber.new{ raise 'test' }.resume"