I was working on a database grants (Firebird 2.5.2) and I just noticed
that it's possible to assign an role to a user that not exists without
raise any exception.
Is that supposed to be right?

Here is a screenshot of IBExpert UI: link
<http://imageshack.us/a/img11/4586/userroles.png>
The inexistent user is shown in gray color and stroked-through.

Thanks in advance
Micheus



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