More concurrency debugging

lexer.go

@@ -150,6 +150,7 @@ func (l *Lexer) next() rune {
 }
 
 func (l *Lexer) run() {
+	defer l.chanMutex.Unlock()
 	for state := lexText; state != nil; {
 		state = state(l)
 	}

states.go

@@ -2,6 +2,8 @@ package wikilink
 
 import (
 	"strings"
+
+	"go.uber.org/zap"
 )
 
 func isOpenLink(s string) bool {
@@ -27,6 +29,9 @@ func isBlockRef(s string) bool {
 func lexIdent(l *Lexer) stateFn {
 	for {
 		r := l.next()
+		l.L.Named("lexIdent").Debug("stepping through lexIdent",
+			zap.String("r", string(r)),
+		)
 		s := l.input[l.GetPos():]
 		if r == '\\' { // i think this will handle escape characters?
 			break