FIxed the timer and the example

examples/y/main.orc

@@ -1,7 +0,0 @@
-import system::async::(set_timer, yield)
-import system::io::(readln, println)
-
-const main := (
-  set_timer true 1 (println "y" yield)
-    \cancel. readln \a. cancel
-)

examples/yes/main.orc

@@ -0,0 +1,9 @@
+import system::async::(set_timer, yield)
+import system::io::(readln, println)
+import std::exit_status
+
+const main := (
+  set_timer true 1 (println "y" yield) \cancel.
+    readln \a.
+      cancel exit_status::success
+)