5485 - promote SubX to top-level

1 files changed, 37 insertions, 0 deletions

diff --git a/archive/2.vm/continuation2.mu b/archive/2.vm/continuation2.mu
new file mode 100644
index 00000000..45a65e9f
--- /dev/null
+++ b/archive/2.vm/continuation2.mu
@@ -0,0 +1,37 @@
+# Example program showing that a 'paused' continuation can be 'resumed'
+# multiple times from the same point (but with changes to data).
+#
+# To run:
+#   $ git clone https://github.com/akkartik/mu
+#   $ cd mu
+#   $ ./mu continuation2.mu
+#
+# Expected output:
+#   1
+#   2
+#   3
+
+def main [
+  local-scope
+  l:&:list:num <- copy null
+  l <- push 3, l
+  l <- push 2, l
+  l <- push 1, l
+  k:continuation <- call-with-continuation-mark 100/mark, create-yielder, l
+  {
+    x:num, done?:bool <- call k
+    break-if done?
+    $print x 10/newline
+    loop
+  }
+]
+
+def create-yielder l:&:list:num -> n:num, done?:bool [
+  local-scope
+  load-inputs
+  return-continuation-until-mark 100/mark
+  done? <- equal l, null
+  return-if done?, 0/dummy
+  n <- first l
+  l <- rest l
+]