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: flag.go
    path of file: ./repos/torsniff/vendor/github.com/spf13/pflag
    
    the code of the file until where you have to start completion: // Copyright 2009 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.

/*
Package pflag is a drop-in replacement for Go's flag package, implementing
POSIX/GNU-style --flags.

pflag is compatible with the GNU extensions to the POSIX recommendations
for command-line 
    
func wrap(i, w int, s string) string {
	if w == 0 {
		return strings.Replace(s, "\n", "\n"+strings.Repeat(" ", i), -1)
	}

	// space between indent i and end of line width w into which
	// we should wrap the text.
	wrap := w - i

	var r, l string

	// Not enough space for sensible wrapping. Wrap as a block on
	// the next line instead.
	if wrap < 24 {
		i = 16
		wrap = w - i
		r += "\n" + strings.Repeat(" ", i)
	}
	// If still not enough space then don't even try to wrap.
	if wrap < 24 {
		return strings.Replace(s, "\n", r, -1)
	}

	// Try to avoid short orphan words on the final line, by
	// allowing wrapN to go a bit over if that would fit in the
	// remainder of the line.
	slop := 5
	wrap = wrap - slop

	// Handle first line, which is indented by the caller (or the
	// special case above)
	l, s = wrapN(wrap, slop, s)
	r = r + strings.Replace(l, "\n", "\n"+strings.Repeat(" ", i), -1)

	// Now wrap the rest
	for s != "" {
		var t string

		t, s = wrapN(wrap, slop, s)
		r = r + "\n" + strings.Repeat(" ", i) + strings.Replace(t, "\n", "\n"+strings.Repeat(" ", i), -1)
	}

	return r

}