diff -r ac3cb5e05a38 -r 6d3b67a837a6 mercurial/ui.py
--- a/mercurial/ui.py	Sat Dec 28 01:12:19 2019 -0500
+++ b/mercurial/ui.py	Sat Dec 28 01:35:05 2019 -0500
@@ -1626,7 +1626,7 @@
         # prompt to start parsing. Sadly, we also can't rely on
         # choices containing spaces, ASCII, or basically anything
         # except an ampersand followed by a character.
-        m = re.match(br'(?s)(.+?)\$\$([^\$]*&[^ \$].*)', prompt)
+        m = re.match(br'(?s)(.+?)\$\$([^$]*&[^ $].*)', prompt)
         msg = m.group(1)
         choices = [p.strip(b' ') for p in m.group(2).split(b'$$')]