Macro struct_with_union_into_bytes 

macro_rules! struct_with_union_into_bytes {
    ($ty:ty { $($($field:ident).*: $value:expr,)* }) => { ... };
}

Initializes the given fields of a struct or union and returns the bytes of the resulting object as a byte array.

struct_with_union_into_bytes is invoked like so:

union Foo {
    a: u8,
    b: u16,
}

struct Bar {
    a: Foo,
    b: u8,
    c: u16,
}

struct_with_union_into_bytes!(Bar { a.b: 1, b: 2, c: 3 })

Each named field is initialized with a value whose type must implement zerocopy::IntoBytes. Any fields which are not explicitly initialized will be left as all zeroes.