// The expected form of the attribute clause is:
//
// empty,           yielding (false, obj.ABI0)
// "<>",            yielding (true,  obj.ABI0)
// "<ABI0>"         yielding (false, obj.ABI0)
// "<ABIInternal>"  yielding (false, obj.ABIInternal)
//
// Anything else beginning with "<" logs an error if issueError is
// true, otherwise returns (false, obj.ABI0).
func (p *Parser) symRefAttrs(name string, issueError bool) (bool, obj.ABI) {