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#include <iostream>
using namespace std;
 
class MyClass 
{
    public:
 
        enum myEnum
        {
            a = 0b0;
            b = 0b1;
        };
 
        union myUnion
        {
            uint32_t all;
 
            struct myStruct
            {
                uint32_t start     : 0b1;
                uint32_t enumValue : myEnum::a;
            } bits;
        };
}
 
int main() {
	MyClass m;
	return 0;
}

prog.cpp:10:20: error: expected ‘}’ before ‘;’ token
             a = 0b0;
                    ^
prog.cpp:11:13: error: ‘b’ does not name a type
             b = 0b1;
             ^
prog.cpp:21:38: error: ‘myEnum’ has not been declared
                 uint32_t enumValue : myEnum::a;
                                      ^~~~~~
prog.cpp:24:1: error: expected declaration before ‘}’ token
 }
 ^

Standard output is empty