lst-0152-book.cpp
auto func() -> int;
auto func() -> std::string;
auto func() -> void;
auto func() -> std::pair<int,std::string>;
auto func() -> vector<int>;
auto func() -> vector<int>&;
auto func() -> const vector<int>&;
auto func() -> int;
auto func() -> std::string;
auto func() -> void;
auto func() -> std::pair<int,std::string>;
auto func() -> vector<int>;
auto func() -> vector<int>&;
auto func() -> const vector<int>&;