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#include <iostream>
#include <cstddef>
 
int templateParam;
 
template <int &D> struct TestTemplate {
    int value() {}
};
 
template <> int TestTemplate<templateParam>::value() {
    return templateParam;
}
 
TestTemplate<templateParam> testVariable;
 
int main() {
 
    std::cout << testVariable.value() << "\n";
 
    return 0;
}

prog.cpp:10:17: error: prototype for 'int TestTemplate<D>::value() [with int& D = (* & templateParam)]' does not match any in class 'TestTemplate<(* & templateParam)>'
 template <> int TestTemplate<templateParam>::value() {
                 ^
prog.cpp:7:9: error: candidate is: int TestTemplate<D>::value() [with int& D = (* & templateParam)]
     int value() {}
         ^

Standard output is empty