raise(...) public

Raises an exception (see Kernel::raise) from thr. The caller does not have to be thr.

   Thread.abort_on_exception = true
   a = Thread.new { sleep(200) }
   a.raise("Gotcha")

produces:

   prog.rb:3: Gotcha (RuntimeError)
    from prog.rb:2:in `initialize'
    from prog.rb:2:in `new'
    from prog.rb:2
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