Fixes warnings on Rust 1.83

Author: ultimaweapon

src/debug.rs

@@ -29,6 +29,7 @@ macro_rules! debugln {
 /// for how to enable the debug writer.
 pub fn debug_writer() -> Option<&'static RefCell<Box<dyn Write>>> {
     // SAFETY: This is safe because the only place that write DEBUG_WRITER is our init function.
+    #[allow(static_mut_refs)]
     unsafe { DEBUG_WRITER.as_ref() }
 }