feat(env): Rc

src/ty/internal/func.rs

@@ -1,6 +1,3 @@
-use std::collections::HashMap;
-use std::rc::Rc;
-
 use derive_more::Constructor;
 use itertools::Itertools;
 
@@ -46,7 +43,7 @@ pub type JITFunc<'vm> =
 #[derive(Debug, Clone, Constructor)]
 pub struct Func<'vm> {
     pub func: &'vm BFunc,
-    pub env: Rc<Env<'vm>>,
+    pub env: Env<'vm>,
     pub compiled: Option<JITFunc<'vm>>,
 }
 
@@ -54,10 +51,10 @@ impl<'vm> Func<'vm> {
     pub fn call(&self, vm: &'vm VM<'_>, arg: Value<'vm>) -> Result<Value<'vm>> {
         use Param::*;
 
-        let env = Rc::new(self.env.as_ref().clone());
+        let mut env = self.env.clone();
 
         match self.func.param.clone() {
-            Ident(ident) => env.enter([(ident.into(), arg)].into_iter()),
+            Ident(ident) => env = env.enter([(ident.into(), arg)].into_iter()),
             Formals {
                 formals,
                 ellipsis,
@@ -88,7 +85,7 @@ impl<'vm> Func<'vm> {
                 if let Some(alias) = alias {
                     new.push((alias.clone().into(), Value::AttrSet(arg)));
                 }
-                env.enter(new.into_iter());
+                env = env.enter(new.into_iter());
             }
         }