fix: fix build, improve error handling

Signed-off-by: Henry Gressmann <mail@henrygressmann.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/examples/rust/src/hello.rs b/examples/rust/src/hello.rs
index c8e2ac3..3d9f400 100644
--- a/examples/rust/src/hello.rs
+++ b/examples/rust/src/hello.rs
@@ -1,23 +1,23 @@
 #![no_main]
 
 #[link(wasm_import_module = "env")]
-extern "C" {
+unsafe extern "C" {
     fn print_utf8(location: i64, len: i32);
 }
 
 const ARG: &[u8] = &[0u8; 100];
 
-#[no_mangle]
+#[unsafe(no_mangle)]
 pub unsafe extern "C" fn arg_ptr() -> i32 {
     ARG.as_ptr() as i32
 }
 
-#[no_mangle]
+#[unsafe(no_mangle)]
 pub unsafe extern "C" fn arg_size() -> i32 {
     ARG.len() as i32
 }
 
-#[no_mangle]
+#[unsafe(no_mangle)]
 pub unsafe extern "C" fn hello(len: i32) {
     let arg = core::str::from_utf8(&ARG[0..len as usize]).unwrap();
     let res = format!("Hello, {}!", arg).as_bytes().to_vec();