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View Compilation Error

0_0_19920423_6462.cpp: In function 'int cmp(const void*, const void*)':
0_0_19920423_6462.cpp:13:28: error: invalid use of incomplete type 'struct cmp(const void*, const void*)::s'
     return (*(struct s *)a).v-(*(struct s *)b).v;
                            ^
0_0_19920423_6462.cpp:13:22: error: forward declaration of 'struct cmp(const void*, const void*)::s'
     return (*(struct s *)a).v-(*(struct s *)b).v;
                      ^
0_0_19920423_6462.cpp:13:47: error: invalid use of incomplete type 'struct cmp(const void*, const void*)::s'
     return (*(struct s *)a).v-(*(struct s *)b).v;
                                               ^
0_0_19920423_6462.cpp:13:22: error: forward declaration of 'struct cmp(const void*, const void*)::s'
     return (*(struct s *)a).v-(*(struct s *)b).v;
                      ^


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