Remove unused collect_parameter_slots

This function was no longer being called and was removed as part of a
refactoring.

src/ast/compiler/optimizer/engine.rs

@@ -581,7 +581,6 @@ impl Optimizer {
                 }
 
                 let params_opt = self.visit_node(params.clone(), &mut next_inner_subs, path);
-                inliner.collect_parameter_slots(&params_opt, &mut next_inner_subs);
 
                 let body_opt = self.visit_node(body.clone(), &mut next_inner_subs, path);
                 let reindexed_body = if new_upvalues.len() != upvalues.len() {

src/ast/compiler/optimizer/inliner.rs

@@ -157,22 +157,4 @@ impl<'a> Inliner<'a> {
             _ => {}
         }
     }
-
-    pub fn collect_parameter_slots(&self, node: &AnalyzedNode, sub: &mut SubstitutionMap) {
-        match &node.kind {
-            BoundKind::Define {
-                addr: Address::Local(slot),
-                ..
-            } => {
-                sub.slot_mapping.insert(*slot, *slot);
-                sub.next_slot = sub.next_slot.max(slot.0 + 1);
-            }
-            BoundKind::Tuple { elements } => {
-                for el in elements {
-                    self.collect_parameter_slots(el, sub);
-                }
-            }
-            _ => {}
-        }
-    }
 }