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#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";
}
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