From 145006b4000f9b4dffb4e69c6f95cd87023ff246 Mon Sep 17 00:00:00 2001
From: Berkus Decker <berkus+github@metta.systems>
Date: Fri, 27 Nov 2020 23:51:54 +0200
Subject: [PATCH] wip caps

---
 nucleus/src/arch/aarch64/caps.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/nucleus/src/arch/aarch64/caps.rs b/nucleus/src/arch/aarch64/caps.rs
index ca7b2ff..2d4a056 100644
--- a/nucleus/src/arch/aarch64/caps.rs
+++ b/nucleus/src/arch/aarch64/caps.rs
@@ -532,5 +532,12 @@ mod tests {
     // use super::*;
 
     #[test_case]
-    fn first_capability_derivation_has_no_prev_link() {}
+    fn first_capability_derivation_has_no_prev_link() {
+        let entry = CapTableEntry::empty();
+        assert_eq!(entry.derivation_node.try_get_prev(), Err(DerivationTreeError::InvalidPrev));
+    }
 }
+
+// @todo Use bitmatch over cap Type field?
+// Could be interesting if usable. See https://github.com/porglezomp/bitmatch
+// Maybe look at https://lib.rs/crates/enumflags2 too