Remove unecessary push_item from distillation

Author: Kmeakin

fathom/src/surface/distillation.rs

@@ -19,7 +19,7 @@ pub struct Context<'interner, 'arena, 'env> {
     /// Scoped arena for storing distilled terms.
     scope: &'arena Scope<'arena>,
     /// Item name environment.
-    item_names: &'env mut UniqueEnv<StringId>,
+    item_names: &'env UniqueEnv<StringId>,
     /// Local name environment.
     local_names: &'env mut UniqueEnv<Option<StringId>>,
     /// Metavariable sources.
@@ -31,7 +31,7 @@ impl<'interner, 'arena, 'env> Context<'interner, 'arena, 'env> {
     pub fn new(
         interner: &'interner RefCell<StringInterner>,
         scope: &'arena Scope<'arena>,
-        item_names: &'env mut UniqueEnv<StringId>,
+        item_names: &'env UniqueEnv<StringId>,
         local_names: &'env mut UniqueEnv<Option<StringId>>,
         meta_sources: &'env UniqueEnv<MetaSource>,
     ) -> Context<'interner, 'arena, 'env> {
@@ -52,10 +52,6 @@ impl<'interner, 'arena, 'env> Context<'interner, 'arena, 'env> {
         self.item_names.get_level(var).copied()
     }
 
-    fn push_item(&mut self, name: StringId) {
-        self.item_names.push(name);
-    }
-
     fn get_local_name(&self, var: Index) -> Option<StringId> {
         self.local_names.get_index(var).copied().flatten()
     }
@@ -107,7 +103,6 @@ impl<'interner, 'arena, 'env> Context<'interner, 'arena, 'env> {
             } => {
                 let r#type = scope.to_scope(self.synth(r#type));
                 let expr = scope.to_scope(self.check(expr));
-                self.push_item(*label);
 
                 Item::Def(ItemDef {
                     range: (),

fathom/src/surface/elaboration.rs

@@ -360,7 +360,7 @@ impl<'interner, 'arena> Context<'interner, 'arena> {
                     let surface_term = distillation::Context::new(
                         self.interner,
                         self.scope,
-                        &mut self.item_env.names,
+                        &self.item_env.names,
                         &mut self.local_env.names,
                         &self.meta_env.sources,
                     )
@@ -408,7 +408,7 @@ impl<'interner, 'arena> Context<'interner, 'arena> {
         distillation::Context::new(
             self.interner,
             scope,
-            &mut self.item_env.names,
+            &self.item_env.names,
             &mut self.local_env.names,
             &self.meta_env.sources,
         )