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typedef struct _A A;
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typedef struct _A B;
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void some_function(B *b);
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class AClass {
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public:
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operator A*() { return 0;}
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};
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class BClass :public AClass {
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public:
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operator B*() { return 0;}
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};
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int main(int argc, char **argv) {
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BClass b;
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some_function(b);
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}
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