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: iter.go
    path of file: ./repos/trickster/vendor/golang.org/x/text/unicode/norm
    
    the code of the file until where you have to start completion: // Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// 
    
func nextCGJCompose(i *Iter) []byte {
	i.rb.ss = 0 // instead of first
	i.rb.insertCGJ()
	i.next = nextComposed
	// Note that we treat any rune with nLeadingNonStarters > 0 as a non-starter,
	// even if they are not. This is particularly dubious for U+FF9E and UFF9A.
	// If we ever change that, insert a check here.
	i.rb.ss.first(i.info)
	i.rb.insertUnsafe(i.rb.src, i.p, i.info)
	return doNormComposed(i)
}