ed could make clearer error messages

[Dan Jacobson]

ed could be clearer in its error messages.  e.g. instead of saying
script, line 2: Unknown command
it could say
script, line 2: {: Unknown command

  ed $i <<EOF
H
/<ADDRESS>/,/<\/ADDRESS>/{
s#href="http://www.jidanni.org/";>Dan Jacobson#href="$home">Dan Jacobson#
}
wq
EOF

gives

script, line 2: Unknown command

By the way, perhaps add all sed stuff missing in ed to ed, e.g. "{"

Also make sure both sed and ed produce emacs M-x compile parsable
error line numbers... 
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