Function opcodeTuck

txscript/opcode.go:1375–1377

opcodeTuck inserts a duplicate of the top item of the data stack before the second-to-top item. Stack transformation: [... x1 x2] -> [... x2 x1 x2]

(op *opcode, data []byte, vm *Engine)

//
// Stack transformation: [... x1 x2] -> [... x2 x1 x2]
func opcodeTuck(op *opcode, data []byte, vm *Engine) error {
	return vm.dstack.Tuck()
}

// opcodeSize pushes the size of the top item of the data stack onto the data
// stack.