feat: ir env (WIP)

src/env.rs

@@ -3,7 +3,7 @@ use std::hash::Hash;
 use gc_arena::{Collect, Gc, Mutation};
 use hashbrown::HashMap;
 
-use crate::ty::internal::Value;
+use crate::{ir::Ir, ty::internal::Value};
 
 #[derive(Collect)]
 #[collect(no_drop)]
@@ -21,6 +21,7 @@ pub struct LetEnv<'gc, K: Hash + Eq + Collect<'gc>, V: Collect<'gc>> {
 }
 
 pub type VmEnv<'gc> = Env<'gc, usize, Value<'gc>>;
+pub type IrEnv<'gc> = Env<'gc, usize, Ir>;
 
 #[derive(Default, Clone, Collect)]
 #[collect(no_drop)]
@@ -62,13 +63,25 @@ impl<'gc, K: Hash + Eq + Clone + Collect<'gc>, V: Clone + Collect<'gc>> Env<'gc,
         )
     }
 
-    pub fn lookup(&self, symbol: &K) -> Option<&V> {
+    pub fn lookup_slow(&self, symbol: &K) -> Option<&V> {
         if let Some(val) = self.let_.lookup(symbol) {
             return Some(val);
         }
         self.with.lookup(symbol)
     }
 
+    pub fn lookup_let(&self, symbol: &K) -> Option<&V> {
+        self.let_.lookup(symbol)
+    }
+
+    pub fn lookup_with(&self, symbol: &K) -> Option<&V> {
+        self.with.lookup(symbol)
+    }
+
+    pub fn has_with(&self) -> bool {
+        self.with.map.is_some()
+    }
+
     pub fn enter_arg(self: Gc<'gc, Self>, ident: K, val: V, mc: &Mutation<'gc>) -> Gc<'gc, Self> {
         Gc::new(
             mc,