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: parser.go
    path of file: ./repos/plumber/vendor/github.com/ardielle/ardielle-go/rdl
    
    the code of the file until where you have to start completion: // Copyright 2015 Yahoo Inc.
// Licensed under the terms of the Apache version 2.0 license. See LICENSE file for terms.

    
func (p *parser) includedFile(filename string) bool {
	if p.parent != nil {
		return p.parent.includedFile(filename)
	}
	if p.included != nil {
		if _, ok := p.included[filename]; ok {
			return true
		}
	}
	return false
}