Wait, is that an integer, or an array? Serious question, with initialiser lists I'm not sure any more.

    auto i = {5};

is a std::initializer_list<int>, whereas

    auto i{5};

is an int (as of C++17): https://godbolt.org/g/eXXN3o

See also https://stackoverflow.com/questions/25612262/why-does-auto-x... .

If you change the compiler version (to e.g. gcc7) your blurb compiles in C++14.

Don't sweat it, it's `auto.` Whatever you meant it to be will be deduced by the compiler. ;)