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cpp_clang
#include <iostream>
constexpr void foo() {
std::cout << "KEK";
}
int main(){
}
1399573560/source.cpp:3:16: error: constexpr function never produces a constant expression [-Winvalid-constexpr]
constexpr void foo() {
^
1399573560/source.cpp:4:12: note: non-constexpr function 'operator<<<std::__1::char_traits<char> >' cannot be used in a constant expression
std::cout << "KEK";
^
/usr/include/c++/v1/ostream:862:1: note: declared here
operator<<(basic_ostream<char, _Traits>& __os, const char* __str)
^
1 error generated.
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