bug#36204: unmatched `{' with r

[Dan Jacobson]

$ seq 3 | sed -n '2{s/2/X/ ; r /dev/null }'
sed: -e expression #1, char 0: unmatched `{'
$ seq 3 | sed -n '2{s/2/X/ ; r /dev/null ; }'
sed: -e expression #1, char 0: unmatched `{'

If r is special and needs a terminating newline for some reason, then
please mention it on the r documentation, and show how to make the above
one liner work.

sed (GNU sed) 4.7