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Incomplete enums

Forward declarations of enums are supported.

Example

enum Incomplete_Enums_0;
int Incomplete_Enums_2 (enum Incomplete_Enums_0 * passon)
{
    return 0;
}
int Incomplete_Enums_1 (enum Incomplete_Enums_0 * passon)
{
    return Incomplete_Enums_2(passon);
}
enum Incomplete_Enums_0 { ALPHA, BETA, GAMMA };