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
+)

src/utils/poller.rs

@@ -101,7 +101,7 @@ impl<TEv, TOnce, TRec: Clone + Send> Poller<TEv, TOnce, TRec> {
       TimerKind::Recurring { period, data_cell } => {
         let data = data_cell.clone_out()?;
         self.timers.push(Timer {
-          expires,
+          expires: expires + period,
           kind: TimerKind::Recurring { period, data_cell },
         });
         PollEvent::Recurring(data)