i += size
	}
	p.s = p.s[i+1:]
	return string(qsb), nil
}

// consumeAtom parses an RFC 5322 atom at the start of p.
// If dot is true, consumeAtom parses an RFC 5322 dot-atom instead.
// If permissive is true, consumeAtom will not fail on:
// - leading/trailing/double dots in the atom (see golang.org/issue/4938)
func (p *addrParser) consumeAtom(dot bool, permissive bool) (atom string, err error) {
	i := 0

Loop:
	for {