diff --git a/core/dr-inference-engine/src/lib.rs b/core/dr-inference-engine/src/lib.rs
index 5e726e9..da36671 100644
--- a/core/dr-inference-engine/src/lib.rs
+++ b/core/dr-inference-engine/src/lib.rs
@@ -41,6 +41,10 @@ pub enum Role {
     EyeClassifier,
     /// XFeat, the panorama keypoint detector (docs/panorama.md).
     Keypoints,
+    /// MI-GAN, the panorama border filler (docs/panorama.md §12). Plain
+    /// convolutions, so any rung serves it; fp16 on TensorRT and int8 on
+    /// the Hexagon are the point of it.
+    Inpainter,
 }
 
 /// Which numeric form of a model a session was built from.
@@ -94,7 +98,7 @@ impl Rung {
     }
 
     /// The model form this rung wants for a role.
-    fn form(self, role: Role) -> Form {
+    fn form(self, _role: Role) -> Form {
         match self {
             Rung::Hexagon => Form::Int8,
             _ => Form::F32,