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#include <map>
 
int main()
{
	// Comparison lambda (see https://e...content-available-to-author-only...e.com/w/cpp/container/map/map).
    auto comp = [](int a, int b) { return b < a; };
 
	// This compiles.
    std::map<int, int> m1 {{5, 6}, {3, 4}, {1, 2}};
 
    // This also compiles.
    std::map<int, int, decltype(comp)> m2(comp);
 
	// This doesn't compile (error: expected ‘}’ at end of input).
    std::map<int, int, decltype(comp)> m3(comp) {{5, 6}, {3, 4}, {1, 2}};
 
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:15:49: error: expected ‘,’ or ‘;’ before ‘{’ token
     std::map<int, int, decltype(comp)> m3(comp) {{5, 6}, {3, 4}, {1, 2}};
                                                 ^
prog.cpp:18:1: error: expected ‘}’ at end of input
 }
 ^

Standard output is empty