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#include <array>
#include <iostream>
 
template <typename ...ArgsT>
void foobar (ArgsT ...a) {
    std::array<int, sizeof... (ArgsT)> args {a...};
    std::cout << "{";
    for (auto i : args) std::cout << i;
    std::cout << "}\n";
}
 
int main () {
    foobar ();
    foobar (1, 2, 3);
}

prog.cpp: In function 'void foobar(ArgsT ...)':
prog.cpp:8:17: error: expected initializer before ':' token
prog.cpp:10:1: error: expected primary-expression before '}' token
prog.cpp:10:1: error: expected ')' before '}' token
prog.cpp:10:1: error: expected primary-expression before '}' token
prog.cpp:10:1: error: expected ';' before '}' token

Standard output is empty