Version 4.20 rule file bug?

[Rose, Bobby]

I updated my test box first from 4.19 and Mailscanner won't start.  The
logs have

MailScanner[10515]: MailScanner E-Mail Virus Scanner version 4.20-2
starting...
MailScanner[10515]: Syntax error in line 20 of ruleset
/opt/MailScanner/etc/rules/spam.actions.rules
MailScanner[10515]: Syntax error in line 21 of ruleset
/opt/MailScanner/etc/rules/spam.actions.rules
MailScanner[10515]: Aborting due to syntax errors in
/opt/MailScanner/etc/rules/spam.actions.rules.

The rules in question are 

To:     jdoe at x.y.z     delete forward spamtroll at x.y.z
To:     x.y.z           deliver forward spamtroll at x.y.z
FromTo: default                 deliver

This was fine in 4.19.  Is it a bug?