Add a uniq test module for yunq in rust.

rust/lib/mammoth/Cargo.toml

@@ -9,4 +9,6 @@ name = "mammoth"
 [dependencies]
 linked_list_allocator = "0.10.5"
 
-[build-dependencies]
+[features]
+hosted = []
+default = ["hosted"]

rust/lib/mammoth/src/mem.rs

@@ -2,13 +2,17 @@ use crate::cap::Capability;
 use crate::syscall;
 use crate::zion::ZError;
 use alloc::slice;
+
+#[cfg(feature = "hosted")]
 use linked_list_allocator::LockedHeap;
 
+#[cfg(feature = "hosted")]
 #[global_allocator]
 static ALLOCATOR: LockedHeap = LockedHeap::empty();
 
 pub static mut CAN_ALLOC: bool = false;
 
+#[cfg(feature = "hosted")]
 pub fn init_heap() {
     // 1 MiB
     let size = 0x10_0000;

rust/lib/mammoth/src/syscall.rs

@@ -5,6 +5,8 @@ use crate::zion;
 use crate::zion::z_cap_t;
 use crate::zion::ZError;
 use core::ffi::c_void;
+
+#[cfg(feature = "hosted")]
 use core::panic::PanicInfo;
 
 #[must_use]
@@ -18,6 +20,7 @@ fn syscall<T>(id: u64, req: &T) -> Result<(), ZError> {
     Ok(())
 }
 
+#[cfg(feature = "hosted")]
 #[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
     unsafe {