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struct s1 { int a; int b; int c; void f1(int*); struct s3 { double arch; int x; int y; int z; }; } ; struct s1::s3;
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struct s1 { int a; int b; int c; void f1(int*); struct s3 { double arch; int x; int y; int z; }; }; s1 MyOwnStruct; int main() { MyOwnStruct.s3.x; }
s1::s3