是否可以在Go中的单值上下文中有选择地获取返回值？

A simple example:

package main

import "fmt"

func hereTakeTwo() (x, y int) {
    x = 0
    y = 1
    return
}

func gimmeOnePlease(x int){
    fmt.Println(x)
}

func main() {
    gimmeOnePlease(hereTakeTwo()) // fix me
}

Is it possible to pass only first returned value from hereTakeTwo() without using an explicit _ assignment? Example of what I would like to avoid:

func main() {
    okJustOne, _ := hereTakeTwo()
    gimmeOnePlease(okJustOne)
}

What I want is to make gimmeOnePlease function able to receive an undefined number of arguments but take only first one OR a way to call hereTakeTwo function and get only first returned value without the necessity to use _ assignments.

Or on a last resort (crazy idea) use some kind of adapter function, that takes N args and reurns only first one, and have something like:

func main() {
    gimmeOnePlease(adapter(hereTakeTwo()))
}

Why? I'm just testing the boundaries of the language and learning how flexible it can be to some purposes.

No, you cannot do that apart from one special case described in the Spec:

As a special case, if the return values of a function or method g are equal in number and individually assignable to the parameters of another function or method f, then the call f(g(parameters_of_g)) will invoke f after binding the return values of g to the parameters of f in order. The call of f must contain no parameters other than the call of g, and g must have at least one return value.

The best you can do besides the temporary variables (which are the best option) is this:

func first(a interface{}, _ ...interface{}) interface{} {
    return a
}

func main() {
    gimmeOnePlease(first(hereTakeTwo()).(int))
}

Playground: http://play.golang.org/p/VXv-tsYjXt

Variadic version: http://play.golang.org/p/ulpdp3Hppj