class ActionDispatch::ExceptionWrapper

def initialize(backtrace_cleaner, exception)
  @backtrace_cleaner = backtrace_cleaner
  @exception_class_name = exception.class.name
  @wrapped_causes = wrapped_causes_for(exception, backtrace_cleaner)
  @exception = exception
  if exception.is_a?(SyntaxError)
    @exception = ActiveSupport::SyntaxErrorProxy.new(exception)
  end
  @backtrace = build_backtrace
end