[RUBY] To you who absolutely need backtrace

There are times when you want to add backtrace information or cause to an Exception instantiated on the spot. In such a case.

rescue => e
  err = raise RuntimeError.new, 'Let's raise any error!' rescue $!
  p err
  p err.cause
# => #<RuntimeError:Let's raise any error!>
# => #<ZeroDivisionError: divided by 0>

I think this is the fastest

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