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+Compile with `c++ -std=c++=20 main.cpp`.
+
+Tests the spaceship operator.
+
+{{{c++
+#include <iostream>
+#include <compare>
+#include <sstream>
+
+int str_to_int(const char* s) {
+	int ret;
+	std::basic_istringstream<char> is(s);
+	is >> ret;
+	return ret;
+}
+
+int main(int argc, char* argv[]) {
+	if (argc < 3) {
+		std::cerr << "Give at least 2 arguments" << std::endl;
+		return 1;
+	}
+
+	int a, b;
+
+	a = str_to_int(argv[1]);
+	b = str_to_int(argv[2]);
+
+	std::cout << a << " <=> " << b << std::endl;
+	std::strong_ordering result = a <=> b;
+	if (std::is_lt(result)) {
+		std::cout << "LT";
+	} else if (std::is_gt(result)) {
+		std::cout << "GT";
+	} else if (std::is_eq(result)) {
+		std::cout << "EQ";
+	} else {
+		std::cout << "error";
+	}
+
+	std::cout << std::endl;
+	return 0;
+}
+}}}