It's probably not useful in Go's type system. It would be useful if there were union types, though. I sometimes end up using pointers for nullable fields beca

It's probably not useful in Go's type system. It would be useful if there were union types, though. I sometimes end up using pointers for nullable fields because the zero values are significant in whatever domain I'm working in. I either have to make it a pointer, or I have to implement a new special zero value, or I have to make a struct that can keep track of whether a value has been set or not. It'd be nice to be able to do type MyStruct struct { ID int || nil } And have the compiler understand that the ID has to be either an int or nil, and to give me errors if I try to use it as an int without making sure it isn't nil.