diff --git a/src/util/rust/sys/mod.rs b/src/util/rust/sys/mod.rs
index 5acb90839a6..6a6c99ee3a2 100644
--- a/src/util/rust/sys/mod.rs
+++ b/src/util/rust/sys/mod.rs
@@ -10,6 +10,9 @@ pub mod stub;
 #[cfg(windows)]
 pub mod windows;
 
+// Only Linux works for all cases.  Windows works for HANDLEs.
+// Tracking bug: https://gitlab.freedesktop.org/mesa/mesa/-/issues/13826
+
 cfg_if::cfg_if! {
     if #[cfg(any(target_os = "android", target_os = "linux"))] {
         pub use linux as platform;
diff --git a/src/util/rust/sys/stub/tube.rs b/src/util/rust/sys/stub/tube.rs
index a875adbd6e4..21420c83476 100644
--- a/src/util/rust/sys/stub/tube.rs
+++ b/src/util/rust/sys/stub/tube.rs
@@ -42,3 +42,9 @@ impl Listener {
         Err(MesaError::Unsupported)
     }
 }
+
+impl AsBorrowedDescriptor for Listener {
+    fn as_borrowed_descriptor(&self) -> &OwnedDescriptor {
+        unimplemented!()
+    }
+}
diff --git a/src/util/rust/sys/windows/tube.rs b/src/util/rust/sys/windows/tube.rs
index a875adbd6e4..21420c83476 100644
--- a/src/util/rust/sys/windows/tube.rs
+++ b/src/util/rust/sys/windows/tube.rs
@@ -42,3 +42,9 @@ impl Listener {
         Err(MesaError::Unsupported)
     }
 }
+
+impl AsBorrowedDescriptor for Listener {
+    fn as_borrowed_descriptor(&self) -> &OwnedDescriptor {
+        unimplemented!()
+    }
+}