chore: checkpoint before Python removal

vendor/psm/examples/info.rs

@@ -0,0 +1,20 @@
+extern crate psm;
+
+psm::psm_stack_information! {
+    yes {
+        fn main() {
+            println!("Stack is {:?} and is at {:p} currently",
+                     psm::StackDirection::new(), psm::stack_pointer());
+        }
+    }
+    no {
+        fn main() {
+            eprintln!("Stack information not supported by this target");
+        }
+    }
+}
+
+#[test]
+fn run_example() {
+    main();
+}