Create more involved example

libs/walproposer/rust_bindings.h

@@ -3,4 +3,4 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-void rust_function(void);
+void rust_function(uint32_t a);

libs/walproposer/src/lib.rs

@@ -8,9 +8,20 @@ pub mod bindings {
 
 pub use bindings::TestFunc;
 
+use std::cell::RefCell;
+
+thread_local! {
+    pub static TMP_TEST: RefCell<Vec<u32>> = RefCell::new(vec![]);
+}
+
 #[no_mangle]
-pub extern "C" fn rust_function() {
+pub extern "C" fn rust_function(a: u32) {
     println!("Hello from Rust!");
+    println!("a: {}", a);
+    TMP_TEST.with(|f| {
+        f.borrow_mut().push(a);
+        println!("TMP_TEST: {:?}", f.borrow());
+    });
 }
 
 #[cfg(test)]

libs/walproposer/src/test.rs

@@ -1,4 +1,4 @@
-use crate::TestFunc;
+use crate::{TestFunc, TMP_TEST};
 
 #[test]
 fn run_test() {

libs/walproposer/test.c

@@ -4,6 +4,6 @@
 
 int TestFunc(int a, int b) {
     printf("TestFunc: %d + %d = %d\n", a, b, a + b);
-    rust_function();
+    rust_function(0);
     return a + b;
 }