diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs
index c3deda22f0cfdfe0559ccda1054ada090fc6ae46..97986eb6333fd7cc9a11578f68d3aa8fac07799d 100644
--- a/src/protocol/mod.rs
+++ b/src/protocol/mod.rs
@@ -47,26 +47,26 @@ impl ProtocolDescription for ProtocolDescriptionImpl {
             }
         }
     }
-    fn main_interface_polarities(&self) -> Vec<Polarity> {
-        let def = &self.heap[self.main];
-        let mut result = Vec::new();
-        for &param in def.parameters().iter() {
-            let param = &self.heap[param];
-            let type_annot = &self.heap[param.type_annotation];
-            let ptype = &type_annot.the_type.primitive;
-            if ptype == &PrimitiveType::Input {
-                result.push(Polarity::Getter)
-            } else if ptype == &PrimitiveType::Output {
-                result.push(Polarity::Putter)
-            } else {
-                unreachable!()
-            }
-        }
-        result
-    }
-    fn new_main_component(&self, interface: &[Key]) -> ComponentStateImpl {
+    // fn main_interface_polarities(&self) -> Vec<Polarity> {
+    //     let def = &self.heap[self.main];
+    //     let mut result = Vec::new();
+    //     for &param in def.parameters().iter() {
+    //         let param = &self.heap[param];
+    //         let type_annot = &self.heap[param.type_annotation];
+    //         let ptype = &type_annot.the_type.primitive;
+    //         if ptype == &PrimitiveType::Input {
+    //             result.push(Polarity::Getter)
+    //         } else if ptype == &PrimitiveType::Output {
+    //             result.push(Polarity::Putter)
+    //         } else {
+    //             unreachable!()
+    //         }
+    //     }
+    //     result
+    // }
+    fn new_main_component(&self, ports: &[Key]) -> ComponentStateImpl {
         let mut args = Vec::new();
-        for (&x, y) in interface.iter().zip(self.main_interface_polarities()) {
+        for (&x, y) in ports.iter().zip(self.main_interface_polarities()) {
             match y {
                 Polarity::Getter => args.push(Value::Input(InputValue(x))),
                 Polarity::Putter => args.push(Value::Output(OutputValue(x))),