tests/union_underlying_type_test.fbs

namespace UnionUnderlyingType;

table A {
    a: int;
}
table B {
    b: string;
}
table C {
    c: bool;
}
union ABC: int { A = 555, B = 666, C = 777}
table D {
    test_union: ABC;
    test_vector_of_union: [ABC];
}