A codeunit should not have variable declarations declaring the codeunit itself

[rvanbekkum]

It might be nice to have a rule which checks for variable declarations of the form var : Codeunit X in object codeunit X, so referencing itself.
This is often not what you want - it is only what you want in very rare cases. I am often moving procedure declarations from one object to the other during development, which might lead to this happening.
I also thought about other object types, but I think it is particularly relevant for codeunits.