WIP main.cpp and Makefile

rt/Makefile

 CXX=g++-11
-CXXFLAGS=-g -O2 -Wall -Wextra -Werror -std=c++20 -fcoroutines -I.
+CXXFLAGS=-g -O3 -Wall -Wextra -Werror -std=c++20 -fcoroutines -I.

rt/main.cpp

@@ -4,17 +4,15 @@
 
 using namespace typon;
 
-task<int> add(int a, int b) {
-  co_return a + b;
-}
-
-task<void> hello() {
-  puts("hello");
-  co_return;
+task<int> fibo(int n) {
+  if (n < 2) {
+    co_return n;
+  }
+  co_return fibo(n - 1)._result.get() + fibo(n - 2)._result.get();
 }
 
 int main() {
-  hello();
-  int result = add(2, 3)._result.get();
+  int result = fibo(40)._result.get();
+
   printf("%d\n", result);
 }