Wait a moment, are you shure this D code is equivalent to the Nim code you just
posted?
struct Bar { void bar() { "bar".writeln; } }
To me this looks like just a _method_ (in c++ terms). And a _method_ is not a
value member of a struct. In other words it does not increase the size, it is
just the object-oriented way to say this function takes Bar as first argument,
and the syntax to call it is a bit different. But it is not stored at all in
the struct.
type
Bar = object
proc bar(arg: Bar): void = echo "bar"
