Program logic bugs vs input/environmental errors

[Walter Bright via Digitalmars-d]

On 10/31/2014 5:38 PM, "Ola Fosheim Grøstad" 
<ola.fosheim.grostad+dlang at gmail.com>" wrote:
> Transactions roll back when there is contention for resources and/or when you
> have any kind of integrity issue. That's why you have retries… so no, it is not
> only something wrong with the input. Something is temporarily wrong with the
> situation overall.

Those are environmental errors, not programming bugs, and asserting for those 
conditions is the wrong approach.