// (it is token.ILLEGAL), so don't print it.
	if p.trace && p.pos.IsValid() {
		s := p.tok.String()
		switch {
		case p.tok.IsLiteral():
			p.printTrace(s, p.lit)
		case p.tok.IsOperator(), p.tok.IsKeyword():
			p.printTrace("\"" + s + "\"")
		default:
			p.printTrace(s)
		}
	}

	p.pos, p.tok, p.lit = p.scanner.Scan()
}

// Consume a comment and return it and the line on which it ends.

	// (it is token.ILLEGAL), so don't print it.
	if p.trace && p.pos.IsValid() {
		s := p.tok.String()
		switch {
		case p.tok.IsLiteral():
			p.printTrace(s, p.lit)
		case p.tok.IsOperator(), p.tok.IsKeyword():
			p.printTrace("\"" + s + "\"")
		default:
			p.printTrace(s)
		}
	}

	for {
		p.pos, p.tok, p.lit = p.scanner.Scan()
		if p.tok == token.COMMENT {

	used := make(map[string]bool)
	for _, f := range dt.Field {
		ident[f.Name] = f.Name
		used[f.Name] = true
	}

	if !*godefs {
		for cid, goid := range ident {
			if token.Lookup(goid).IsKeyword() {
				// Avoid keyword
				goid = "_" + goid

				// Also avoid existing fields
				for _, exist := used[goid]; exist; _, exist = used[goid] {
					goid = "_" + goid
				}