Add basic `defer` implementation.

We don't have any closures yet, so it's essentially the same as just
moving the statement after the `defer` keyword to the end of the block/
right before returning from the function.

1 files changed, 13 insertions, 0 deletions

diff --git a/examples/defer.cup b/examples/defer.cup
new file mode 100644
index 0000000..e8e4778
--- /dev/null
+++ b/examples/defer.cup
@@ -0,0 +1,13 @@
+fn main() {
+    defer print(1);
+    {
+        defer print(2);
+        {
+            defer print(3);
+            print(4);
+        }
+        print(5);
+        return 0;
+    }
+    print(10);
+}
\ No newline at end of file