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#include <iostream>
#include <initializer_list>
 
struct A {
	A(const std::initializer_list<int>&) { puts("initializer_list<int>"); }		// (1)
	A(const std::initializer_list<float>&) { puts("initializer_list<float>"); }	// (2)
	A(double) { puts("A(double)"); }											// (3)
};
 
int main() {
	A var{ 1.1 };
}

prog.cpp: In function 'int main()':
prog.cpp:11:13: error: call of overloaded 'A(<brace-enclosed initializer list>)' is ambiguous
  A var{ 1.1 };
             ^
prog.cpp:6:2: note: candidate: A::A(const std::initializer_list<float>&)
  A(const std::initializer_list<float>&) { puts("initializer_list<float>"); } // (2)
  ^
prog.cpp:5:2: note: candidate: A::A(const std::initializer_list<int>&)
  A(const std::initializer_list<int>&) { puts("initializer_list<int>"); }  // (1)
  ^

Standard output is empty