This test checks that variadic elimination does not cause a semantic change due
to creation of a non-nil empty slice instead of a nil slice due to missing
variadic arguments.

-- go.mod --
module testdata
go 1.12

-- foo/foo.go --
package foo
import "fmt"

func F(is ...int) {
	if is == nil {
		fmt.Println("is is nil")
	} else {
		fmt.Println("is is not nil")
	}
}

func G(is ...int) { F(is...) }

func main() {
	G() //@ inline(re"G", G)
}

-- G --
package foo

import "fmt"

func F(is ...int) {
	if is == nil {
		fmt.Println("is is nil")
	} else {
		fmt.Println("is is not nil")
	}
}

func G(is ...int) { F(is...) }

func main() {
	F() //@ inline(re"G", G)
}