// TODO fall back on syntax error?

		case '[':
			// Full reference link - [Text][Label]
			label, i, ok := parseLinkLabel(p, s, i+1)
			if !ok {
				break
			}
			if link, ok := p.links[normalizeLabel(label)]; ok {
				return &Link{URL: link.URL, Title: link.Title, corner: link.corner}, i, true
			}
			// Note: Could break here, but CommonMark dingus does not

				title = t
				titleChar = c
			}
		}
	}

	// Must end line. Already trimmed spaces.
	if i < len(s) && s[i] != '\n' {
		return 0, false
	}
	if i < len(s) {
		i++
	}

	label = normalizeLabel(label)
	if p.link(label) == nil {
		p.defineLink(label, &Link{URL: dest, Title: title, TitleChar: titleChar, corner: corner})
	}
	return i, true
}