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/lgo/go/go/printer/testdata
    
    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 parser implements a parser for Go source files. Input may be
// provided in a variety of forms (see the various Parse* functions); the
// output is an abstract syntax tree (AST) representing the Go source. The
// parser is invoked through one of the Parse* functions.

pac
    
func parseConstSpec(p *parser, doc *ast.CommentGroup, iota int) ast.Spec {
	if p.trace {
		defer un(trace(p, "ConstSpec"))
	}

	idents := p.parseIdentList()
	typ := p.tryType()
	var values []ast.Expr
	if typ != nil || p.tok == token.ASSIGN || iota == 0 {
		p.expect(token.ASSIGN)
		values = p.parseRhsList()
	}
	p.expectSemi() // call before accessing p.linecomment

	// Go spec: The scope of a constant or variable identifier declared inside
	// a function begins at the end of the ConstSpec or VarSpec and ends at
	// the end of the innermost containing block.
	// (Global identifiers are resolved in a separate phase after parsing.)
	spec := &ast.ValueSpec{doc, idents, typ, values, p.lineComment}
	p.declare(spec, p.topScope, ast.Con, idents...)

	return spec
}