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
				}

		{"(*FileSet).RemoveFile", Method, 20},
		{"(*FileSet).Write", Method, 0},
		{"(*Position).IsValid", Method, 0},
		{"(Pos).IsValid", Method, 0},
		{"(Position).String", Method, 0},
		{"(Token).IsKeyword", Method, 0},
		{"(Token).IsLiteral", Method, 0},
		{"(Token).IsOperator", Method, 0},
		{"(Token).Precedence", Method, 0},
		{"(Token).String", Method, 0},
		{"ADD", Const, 0},
		{"ADD_ASSIGN", Const, 0},