Well, this design is wrong then, because I'm talking about /etc/crontab ,not 
about /etc/cron.d directory. System crontab ( /etc/crontab ) is protected by 
access rights, so it can't be changed by malicious user.
And any error causes cron almost stop working, because in my case 
/etc/crontab contains all jobs. So , if malicious user has access to it he can 
stop cron from working, and, thus, stop mailing access reports to me, this is 
security hole :-)

I.e. this is not implementation bug, but design bug.

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https://bugs.launchpad.net/bugs/1821566

Title:
  cron ignores whole crontab if one line has error

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