class SyntaxTree::YARV::Throw

def error_backtrace(vm)
  backtrace = []
  current = vm.frame
  while current
    backtrace << "#{current.iseq.file}:#{current.line}:in" \
      "`#{current.iseq.name}'"
    current = current.parent
  end
  [*backtrace, *caller]
end