class SyntaxTree::YARV::Bf

def loop_end(iseq, start_label, end_label)

Jump back to the start of the loop. 
def loop_end(iseq, start_label, end_label)
  iseq.getglobal(:$tape)
  iseq.getglobal(:$cursor)
  iseq.send(YARV.calldata(:[], 1))
  iseq.putobject(0)
  iseq.send(YARV.calldata(:==, 1))
  iseq.branchunless(start_label)
  iseq.push(end_label)
end