Enum omit breaks mapping

Say I have an enum definied in C like this

``` c
enum MyEnum {
SomeA,
SomeB,
SomeC
};
```

Using `{# enum MyEnum {} omit (SomeB) #}` will result in

``` haskell
data MyEnum = SomeA
| SomeC
deriving (Enum)
```

Of course now the mapping is messed up since `SomeB` from C will map to `SomeC` in Haskell.

Edit: Using version `0.27.1 (29 Nov 2015)`