当函数返回多个值时，如何在左侧显式地编写类型？

I can do

n,err:=r.Read(b)

Also I can write

var n,err=r.Read(b)

But on the left I want the types explicitly, like (because this does not work),

var n,err int,error=r.Read(b)

How do I do that?

The only way to accomplish this is having the variables declared before calling the function:

var n ini
var err error
n, err = r.Read(b)