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From the golang spec
// A struct with 6 fields.
struct {
x, y int
u float32
_ float32 // padding
A *[]int
F func()
}
_ fields inside a struct? (some code snippets would be appreciated) 
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An empty struct is a struct type without fields struct{} . The cool thing about an empty structure is that it occupies zero bytes of storage.
An empty structIt occupies zero bytes of storage. As the empty struct consumes zero bytes, it follows that it needs no padding. Thus a struct comprised of empty structs also consumes no storage.
Checking for an empty struct in Go is straightforward in most cases. All you need to do is compare the struct to its zero value composite literal. This method works for structs where all fields are comparable.
Yes, it is allowed in C programming language that we can declare a structure without any member and in that case the size of the structure with no members will be 0 (Zero). It will be a Zero size structure.
The padding is exactly what it is called: Some padding to align the following field to your needs, e.g. to match the layout of a C struct. It cannot be accessed (at least not without package unsafe).
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