page 57 sample codes can not pass compile.

[hobbytp]

In my compiler, the following Enone/Einvalid are marked as RED, and cannot pass compile. I think the arr and sl shall not include them, and in map they shall be string? or you want to show other thing here?

arr := [...]string{Enone: "no error", Einvalid:"invalid argument"}
sl :=[]string{Enone: "no error", Einvalid:"invalid argument"}
ma :=map[int]string{Enone: "no error", Einvalid:"invalid argument"}