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struct a {
    int i;
 
    a(int i)
        : i(i)
    {
    }
};
 
struct b: a {
    using a::a;
};
 
int main() {
    a aa(a(4));
    b c(a(6));
}

prog.cpp: In function ‘int main()’:
prog.cpp:16:13: error: no matching function for call to ‘b::b(a)’
     b c(a(6));
             ^
prog.cpp:16:13: note: candidates are:
prog.cpp:11:14: note: b::b(int)
     using a::a;
              ^
prog.cpp:11:14: note:   no known conversion for argument 1 from ‘a’ to ‘int’
prog.cpp:10:8: note: constexpr b::b(const b&)
 struct b: a {
        ^
prog.cpp:10:8: note:   no known conversion for argument 1 from ‘a’ to ‘const b&’
prog.cpp:10:8: note: constexpr b::b(b&&)
prog.cpp:10:8: note:   no known conversion for argument 1 from ‘a’ to ‘b&&’

Standard output is empty