Merge pull request #3422 from LXIF/patch-3

Update counter.mdx to use current imports, small bugfix

docs/developer-docs/backend/rust/counter.mdx

@@ -49,55 +49,54 @@ Now that you have the files in place for your Rust dapp, you can replace the tem
 To replace the default dapp, open the template `src/rust_counter_backend/src/lib.rs` file in a text editor and delete the existing content. Then, copy and paste this code into the file:
 
 ```rust title="src/rust_counter_backend/src/lib.rs"
-use std::cell::RefCell;
 use candid::types::number::Nat;
+use ic_cdk::{query, update};
+use std::cell::RefCell;
 
 thread_local! {
-    static COUNTER: RefCell<Nat> = RefCell::new(Nat::from(0));
+    static COUNTER: RefCell<Nat> = RefCell::new(Nat::from(0 as u32));
 }
 
 /// Get the value of the counter.
-#[ic_cdk_macros::query]
+#[query]
 fn get() -> Nat {
-    COUNTER.with(|counter| (*counter.borrow()).clone())
+    COUNTER.with(|counter| counter.borrow().clone())
 }
 
 /// Set the value of the counter.
-#[ic_cdk_macros::update]
+#[update]
 fn set(n: Nat) {
-    // COUNTER.replace(n);  // requires #![feature(local_key_cell_methods)]
-    COUNTER.with(|count| *count.borrow_mut() = n);
+    COUNTER.with(|counter| *counter.borrow_mut() = n);
 }
 
-/// Increment the value of the counter.
-#[ic_cdk_macros::update]
+#[update]
 fn increment() {
-    COUNTER.with(|counter| *counter.borrow_mut() += 1);
+    COUNTER.with(|counter| *counter.borrow_mut() += 1 as u32);
 }
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-
-    #[test]
-    fn test_get_set() {
-        let expected = Nat::from(42);
-        set(expected.clone());
-        assert_eq!(get(), expected);
-    }
-
-    #[test]
-    fn test_init() {
-        assert_eq!(get(), Nat::from(0));
-    }
-
-    #[test]
-    fn test_inc() {
-        for i in 1..10 {
-            inc();
-            assert_eq!(get(), Nat::from(i));
-        }
-    }
+    use super::*;
+
+    #[test]
+    fn test_get_set() {
+        let expected = Nat::from(42 as u32);
+        set(expected.clone());
+        assert_eq!(get(), expected);
+    }
+
+    #[test]
+    fn test_init() {
+        assert_eq!(get(), Nat::from(0 as u32));
+    }
+
+    #[test]
+    fn test_inc() {
+        for i in 1..10 {
+            increment();
+            assert_eq!(get(), Nat::from(i as u32));
+        }
+    }
 }
 ```
 
@@ -137,8 +136,8 @@ edition = "2021"
 crate-type = ["cdylib"]
 
 [dependencies]
-candid = "0.8.2"
-ic-cdk = "0.7.0"
+candid = "0.10"
+ic-cdk = "0.13"
 serde = { version = "1.0", features = ["derive"] }
 ic-cdk-macros = "0.8.0"
 ```