op = selection.NotEquals
	default:
		return "", fmt.Errorf("found '%s', expected: %v", lit, strings.Join(binaryOperators, ", "))
	}
	return op, nil
}

// parseValues parses the values for set based matching (x,y,z)
func (p *Parser) parseValues() (sets.String, error) {
	tok, lit := p.consume(Values)
	if tok != OpenParToken {
		return nil, fmt.Errorf("found '%s' expected: '('", lit)
	}
	tok, lit = p.lookahead(Values)

			args = append(args, a)
		}
	}
	return
}

// parseValue parses a parenthesized value from a rule.
// The value can be from the match or the result side.
// It returns the op and unparsed strings for typ, auxint, and aux restrictions and for all args.
// oparch is the architecture that op is located in, or "" for generic.

	for _, kv := range setOverlay {
		kvv := strings.Split(kv, "=")
		if len(kvv) != 2 {
			return "", fmt.Errorf("bad argument %s: expect format key=value", kv)
		}
		k := kvv[0]
		v := util.ParseValue(kvv[1])
		if err := tpath.WriteNode(tree, util.PathFromString(k), v); err != nil {
			return "", err
		}
		// To make errors more user friendly, test the path and error out immediately if we cannot unmarshal.