int f();
int f(); //fine, matches
int f(int); //different signature, fine
float f(); //error: return type does not match
class c;
class c; //fine, matches
struct c; //wrong: does not match
extern int x; //syntactically fine, but completely evil
extern int x; //syntactically still fine, but still completely evil
extern float x; //syntactically wrong, and just as evil
int main(){}
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