fix(rust): properly handle cyclic deps

src/builders/rust/vendor.nix

@@ -11,13 +11,32 @@
 let
   l = lib // builtins;
 
-  getAllDependencies = pname: version:
-    (getDependencies pname version) ++ (getCyclicDependencies pname version);
+  isCyclic = cyclic: dep:
+    l.any (odep: dep.name == odep.name && dep.version == odep.version) cyclic;
 
-  getAllTransitiveDependencies = pname: version:
-    let direct = getAllDependencies pname version; in
+  getUncyclicDependencies = cyclic: deps:
+    l.map
+    (dep: getAllTransitiveDependencies dep.name dep.version)
+    (l.filter (dep: !(isCyclic cyclic dep)) deps);
+
+  getAllTransitiveUncyclicDependencies = pname: version: let
+    cyclic = getCyclicDependencies pname version;
+    direct = getDependencies pname version;
+  in
+    l.unique (l.flatten (direct ++ (getUncyclicDependencies cyclic direct)));
+
+  getAllTransitiveDependencies = pname: version: let
+    direct = getDependencies pname version;
+    cyclic = getCyclicDependencies pname version;
+  in
     l.unique (l.flatten (
-      direct ++ (l.map (dep: getAllTransitiveDependencies dep.name dep.version) direct)
+      direct
+      ++ (getUncyclicDependencies cyclic direct)
+      ++ (
+        l.map
+        (dep: getAllTransitiveUncyclicDependencies dep.name dep.version)
+        (l.filter (isCyclic cyclic) direct)
+      )
     ));
 in {
   # Generates a shell script that writes git vendor entries to .cargo/config.