https://golang.org/ref/spec#Type_assertions
var x interface{} = 7 // x has dynamic type int and value 7
i := x.(int) // i has type int and value 7
type I interface { m() }
var y I
s := y.(string) // illegal: string does not implement I (missing
method m)
r := y.(io.Reader) // r has type io.Reader and y must implement
both I and io.Reader
I don't understand the comment of the last line. Can someone explain it for
me?
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