Program logic bugs vs input/environmental errors (checked exceptions)

[Andrei Alexandrescu via Digitalmars-d]

On 10/5/14, 8:56 AM, Jacob Carlborg wrote:
> I would like to have as specific exception type as possible. Also a nice
> hierarchy of exception when catching a specific exception is not
> interesting. Instead of just a FileException there could be
> FileNotFoundException, PermissionDeniedExcepton and so on.

Exceptions are all about centralized error handling. How, and how often, 
would you handle FileNotFoundException differently than 
PermissionDeniedException?

Andrei