Fix rust compiler warnings.

rust/Cargo.toml

@@ -3,6 +3,7 @@
 members = [
   "lib/mammoth", "lib/yellowstone", "lib/yunq", "lib/yunq-derive", "usr/testbed",
 ]
+resolver = "2"
 
 # the profile used for `cargo build`
 [profile.dev]

rust/lib/yunq/src/message.rs

@@ -31,9 +31,9 @@ pub struct Empty {}
 
 impl YunqMessage for Empty {
     fn parse<const N: usize>(
-        buf: &ByteBuffer<N>,
-        offset: usize,
-        caps: &Vec<z_cap_t>,
+        _buf: &ByteBuffer<N>,
+        _offset: usize,
+        _caps: &Vec<z_cap_t>,
     ) -> Result<Self, ZError>
     where
         Self: Sized,
@@ -43,9 +43,9 @@ impl YunqMessage for Empty {
 
     fn serialize<const N: usize>(
         &self,
-        buf: &mut ByteBuffer<N>,
-        offset: usize,
-        caps: &mut Vec<z_cap_t>,
+        _buf: &mut ByteBuffer<N>,
+        _offset: usize,
+        _caps: &mut Vec<z_cap_t>,
     ) -> Result<usize, ZError> {
         todo!()
     }

yunq/rust/src/lexer.rs

@@ -13,6 +13,7 @@ pub enum TokenType {
 }
 
 #[derive(Debug)]
+#[allow(dead_code)]
 pub struct Token {
     pub token_type: TokenType,
     line: usize,