Golang多次返回超载是地图类型独有的吗？

Question

These both work:

m := make(map[int]int)
elem, ok := m[1]
elem = m[1]

Yet, this not allowed:

func overload() (int, int) {
    return 1, 1
}

func overload() int {
    return 1
}

func main() {
    x := overload()
    x, y := overload()
}

Also, is there a list of built-in syntax that doesn't generalize? I keep getting confused on what is a special syntax, i.e. map[string]int, make([]int, 10) and what is part of the language.

Answer 1

Go doesn't support overloading even if the two functions have different arity in parameters or return values or even if the parameters have different parameter or return types.

http://golang.org/doc/faq#overloading

There is no list of special identifiers or special rules that the built-ins get away with as far as I know. However, they seem to be few and far in-between.