You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mkasm_darwin.go
    path of file: ./repos/cf-tool/vendor/golang.org/x/sys/unix
    
    the code of the file until where you have to start completion: // Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build ignore

// mkasm_darwin.go generates assembly trampolines to call libSystem r
    
func main() {
	in1, err := ioutil.ReadFile("syscall_darwin.go")
	if err != nil {
		log.Fatalf("can't open syscall_darwin.go: %s", err)
	}
	arch := os.Args[1]
	in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch))
	if err != nil {
		log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err)
	}
	in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch))
	if err != nil {
		log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err)
	}
	in := string(in1) + string(in2) + string(in3)

	trampolines := map[string]bool{}

	var out bytes.Buffer

	fmt.Fprintf(&out, "// go run mkasm_darwin.go %s\n", strings.Join(os.Args[1:], " "))
	fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n")
	fmt.Fprintf(&out, "\n")
	fmt.Fprintf(&out, "// +build go1.12\n")
	fmt.Fprintf(&out, "\n")
	fmt.Fprintf(&out, "#include \"textflag.h\"\n")
	for _, line := range strings.Split(in, "\n") {
		if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") {
			continue
		}
		fn := line[5 : len(line)-13]
		if !trampolines[fn] {
			trampolines[fn] = true
			fmt.Fprintf(&out, "TEXT Â·%s_trampoline(SB),NOSPLIT,$0-0\n", fn)
			fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
		}
	}
	err = ioutil.WriteFile(fmt.Sprintf("zsyscall_darwin_%s.s", arch), out.Bytes(), 0644)
	if err != nil {
		log.Fatalf("can't write zsyscall_darwin_%s.s: %s", arch, err)
	}
}