C++
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x
26
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union hello5
{6
struct hi7
{8
uint8_t trees;9
uint8_t plants[6];10
};11
uint8_t forest[1 + 6];12
};13
14
struct world15
{16
hello a;17
};18
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typedef std::vector<world> universe;20
universe alpha;21
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int main() {23
alpha.at(1).a.trees = 1;24
}25
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$ clang++ prog.cc -Wall -Wextra -std=gnu++2a
Start
prog.cc:23:19: error: no member named 'trees' in 'hello' alpha.at(1).a.trees = 1; ~~~~~~~~~~~~~ ^ 1 error generated.
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Finish