$ mkdir temp

 $ go install github.com/tinylib/msgp@latest

 package main
 import (
     "fmt"
 )
 //go:generate msgp
 type QryD struct {
         A int8 
         D int8 
         T string 
         K string 
         V string 
 }
 func main() {
     fmt.Println("Nothing to see here yet!")
 }

 $ go generate

 $ ls -al

	package main
	import (
		"fmt"
	)
	//go:generate msgp
	type QryD struct {
		A int8 
		D int8 
		T string 
		K string 
		V string 
	}
	func main() {
		var valuePlaceholder QryD
		v := QryD{A: 1, D: 9, T: "table", K: "key", V: "value"}
		bts, err := v.MarshalMsg(nil)
		if err != nil {
			// fmt.Println(err) // print err or log error information
		}
		leftovervalues, err := valuePlaceholder.UnmarshalMsg(bts) // purpose of lefovervalues, pls read doc.
		fmt.Println(leftovervalues)
		// leftovervalues is empty because bts only contained one object.
		fmt.Println(valuePlaceholder)
		fmt.Println(valuePlaceholder.A)
		fmt.Println(valuePlaceholder.D)
		fmt.Println(valuePlaceholder.T)
		fmt.Println(valuePlaceholder.K)
		fmt.Println(valuePlaceholder.V)
		if err != nil {
			fmt.Printf("error: %s\n", err)
		}
	}

 $ go build main.go main_gen.go

  $ ./main

	[]
	{1 9 table key value}
	1
	9
	table
	key
	value
	Nothing to see here yet!