Fix cargo warnings in userland.

rust/sys/denali/src/bin/denali.rs

@@ -27,6 +27,6 @@ extern "C" fn main() -> z_err_t {
 
     let thread = spawn_irq_thread(ahci_controller.clone());
 
-    thread.join();
+    thread.join().expect("Failed to wait on irq thread.");
     0
 }

rust/sys/yellowstone/src/server.rs

@@ -1,6 +1,3 @@
-use core::cell::RefCell;
-
-use alloc::rc::Rc;
 use alloc::sync::Arc;
 use alloc::{collections::BTreeMap, string::String};
 use mammoth::sync::Mutex;

yunq/rust/src/codegen.rs

@@ -431,12 +431,8 @@ pub fn generate_code(ast: &Vec<Decl>) -> String {
 
     let interface_imports = if any_interfaces(ast) {
         quote! {
-            use alloc::boxed::Box;
-            use core::ffi::c_void;
             use mammoth::cap::Capability;
             use mammoth::syscall;
-            use mammoth::thread;
-            use yunq::server::YunqServer;
         }
     } else {
         quote! {}