Go - Error for multiple variable assign -

i learner of go language. basic question. please check below sample code, , 3rd line.

a := [3]int{10,20}  var int = 50 i, a[2] = 100,  fmt.println(i)   //100 fmt.println(a)   //[10 20 50] 

i have overwriten value 100 in i variable , applied int array. when printed array, new value not printed. how multiple variable assignment work in go? why i value not updated array immediately?

the assigment section of go spec mentions:

the assignment proceeds in 2 phases.

• first, operands of index expressions , pointer indirections (including implicit pointer indirections in selectors) on left , expressions on right all evaluated in usual order.
• second, assignments carried out in left-to-right order.

that means:

var int = 50 i, a[2] = 100, 

• a[2] assigned i evaluated before assignment (50)
• i assigned 100