Some more Fun VM and Rust interaction. (0.38.2)

examples/rust_hello.fun

@@ -4,7 +4,7 @@
  * This file is part of the Fun programming language.
  * https://fun-lang.xyz/
  *
- * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Copyright 2026 Johannes Findeisen <you@hanez.org>
  * Licensed under the terms of the Apache-2.0 license.
  * https://opensource.org/license/apache-2-0
  *

examples/rust_hello_args.fun

@@ -4,7 +4,7 @@
  * This file is part of the Fun programming language.
  * https://fun-lang.xyz/
  *
- * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Copyright 2026 Johannes Findeisen <you@hanez.org>
  * Licensed under the terms of the Apache-2.0 license.
  * https://opensource.org/license/apache-2-0
  *

examples/rust_vm_access.fun

@@ -0,0 +1,39 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2026 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2026-01-29
+ */
+
+/*
+ * Rust-backed VM access demo:
+ *   - rust_get_sp()   -> reads vm.sp (stack pointer) using raw pointer + offset from Rust
+ *   - rust_set_exit(N) -> writes vm.exit_code = N from Rust
+ */
+
+print("[Rust VM access demo]")
+
+/* Read vm.sp via Rust and print it */
+print("vm.sp (from Rust) = " + to_string(rust_get_sp()))
+
+/* Write vm.exit_code via Rust (not directly observable without VM inspection) */
+print("Setting vm.exit_code to 5 via Rust...")
+rust_set_exit(42)
+
+print("Now exiting...")
+
+/* Expected output:
+[Rust VM access demo]
+vm.sp (from Rust) = 0
+Setting vm.exit_code to 42 via Rust...
+Now exiting...
+*/
+
+// "echo $?" will show the exit code:
+// 42