#include <iostream>

#include <string_view>

#include <utility>

#include <tuple>

struct custom_struct_with_no_stringize_customization { } custom;

main: () -> int = {

a := 2;

b: std::optional<int> = ();

std::cout << "a = (a)$, b = (b)$\n";

b = 42;

std::cout << "a^2 + b = (a * a + b.value())$\n";

sv: std::string_view = "my string_view";

std::cout << "sv = (sv)$\n";

osv: std::optional<std::string_view> = ();

std::cout << "osv = (osv)$\n";

osv = "string literal bound to optional string_view";

std::cout << "osv = (osv)$\n";

var: std::variant<std::monostate, std::string, double> = ();

std::cout << "var = (var)$\n";

var = "abracadabra";

std::cout << "var = (var)$\n";

var = 2.71828;

std::cout << "var = (var)$\n";

mypair: std::pair<int, double> = (12, 3.4);

std::cout << "mypair = (mypair)$\n";

tup1: std::tuple<int> = (12);

tup2: std::tuple<int, double> = (12, 3.4);

tup3: std::tuple<int, double, std::string> = (12, 3.4, "456");

std::cout << "tup1 = (tup1)$\n";

std::cout << "tup2 = (tup2)$\n";

std::cout << "tup3 = (tup3)$\n";

p: std::pair<std::string_view, std::optional<std::string>> = ("first", std::nullopt);

std::cout << "p = (p)$\n";

t: std::tuple<double, std::optional<std::pair<std::string_view, int>>, std::optional<std::tuple<int, int, int>>> = (3.14, std::nullopt, std::nullopt);

std::cout << "t = (t)$\n";

vv: std::variant<int, std::string, std::pair<int, double> > = ();

std::cout << "vv = (vv)$\n";

vv = std::make_pair(1,2.3);

std::cout << "vv = (vv)$\n";

std::cout << "custom = (custom)$\n";

}