函数/结构/接口名称中允许使用哪些字符？

Question

I am new to go and have started playing around with A Tour of Go. I noticed one peculiarity namely that I am allowed to name a function _ but that function can not be called:

import "fmt"

type sel struct {
    s string
}

func _(s string) sel {
    return sel{s}
}

func main() {
    fmt.Println("Hello")
    _("foo") // <-- does not compile
}

If I comment the entire _("foo") line then the program compiles.

My question is what characters are allowed in function names? Is it only alphanumeric characters or can I use $ for instance?

Are the rules for naming other things e.g. structs, interfaces etc. the same as those for functions?

Answer 1

The spec says that func, var or const name must begin with (unicode_letter or _), and can end with many (unicode_letter, unicode_digit or _).

unicode_letter can be a Chinese, or Hebrew letter if you'd like it to.