[Haskell-cafe] Writing a Storable instance for a C union

[Nikita Karetnikov]

Could anyone explain how to write a Storable instance for MyStruct?
(The key field allows to determine the type of a value inside the
union.)

typedef enum Key_ {
  ONE = 1,
  FOUR = 4,
  TWENTY = 20
} Key;

struct MyStruct {
  Key key;
  union {
    Foo one;
    uint64_t four;
    void *twenty;
  };
};

Also, should I use hsc2hs to make the resulting code portable?
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