diff --git a/src/compile.rs b/src/compile.rs
index 5b41b0f..203a65d 100644
--- a/src/compile.rs
+++ b/src/compile.rs
@@ -97,7 +97,9 @@ impl Compile for ir::Thunk {
 
 impl Compile for ir::Attrs {
     fn compile(self, comp: &mut Compiler) {
-        comp.push(OpCode::AttrSet { cap: self.stcs.len() + self.dyns.len() });
+        comp.push(OpCode::AttrSet {
+            cap: self.stcs.len() + self.dyns.len(),
+        });
         for stc in self.stcs {
             stc.1.compile(comp);
             if !self.rec {
diff --git a/src/ty/internal/attrset.rs b/src/ty/internal/attrset.rs
index dca7d84..88e1d02 100644
--- a/src/ty/internal/attrset.rs
+++ b/src/ty/internal/attrset.rs
@@ -1,5 +1,3 @@
-use std::hash::Hash;
-
 use hashbrown::{HashMap, HashSet};
 
 use derive_more::Constructor;
@@ -25,7 +23,9 @@ impl<'vm> AttrSet<'vm> {
     }
 
     pub fn with_capacity(cap: usize) -> Self {
-        AttrSet { data: HashMap::with_capacity(cap) }
+        AttrSet {
+            data: HashMap::with_capacity(cap),
+        }
     }
 
     pub fn push_attr_force(&mut self, sym: usize, val: Value<'vm>) {
diff --git a/src/ty/internal/mod.rs b/src/ty/internal/mod.rs
index a0efbfc..ada48ca 100644
--- a/src/ty/internal/mod.rs
+++ b/src/ty/internal/mod.rs
@@ -1,6 +1,6 @@
+use hashbrown::HashSet;
 use std::cell::OnceCell;
 use std::cell::RefCell;
-use hashbrown::HashSet;
 use std::hash::Hash;
 use std::rc::Rc;
 
diff --git a/src/vm/env.rs b/src/vm/env.rs
index 62a390a..15c02d7 100644
--- a/src/vm/env.rs
+++ b/src/vm/env.rs
@@ -1,5 +1,5 @@
-use std::rc::Rc;
 use hashbrown::HashMap;
+use std::rc::Rc;
 
 use crate::ty::internal::{AttrSet, Value};
 
@@ -16,7 +16,7 @@ impl<'vm> Env<'vm> {
 
     pub fn lookup(&self, symbol: usize) -> Option<Value<'vm>> {
         if let Some(val) = self.map.get(&symbol).cloned() {
-            return Some(val)
+            return Some(val);
         }
         self.last.as_ref().map(|env| env.lookup(symbol)).flatten()
     }
@@ -26,10 +26,6 @@ impl<'vm> Env<'vm> {
     }
 
     pub fn enter(self, new: impl Iterator<Item = (usize, Value<'vm>)>) -> Self {
-        /* let mut map = self.map.clone();
-        for (k, v) in new {
-            map.insert_mut(k, v);
-        } */
         let map = Rc::new(new.collect());
         let last = Some(
             Env {
@@ -42,22 +38,21 @@ impl<'vm> Env<'vm> {
     }
 
     pub fn enter_with(self, new: Rc<AttrSet<'vm>>) -> Self {
-        /* let mut map = self.map.clone();
-        for (k, v) in new.as_inner().iter() {
-            let v = if let Value::Builtins = v {
-                Value::AttrSet(new.clone())
-            } else {
-                v.clone()
-            };
-            map.insert_mut(k.clone(), v);
-        } */
-        let map = Rc::new(new.as_inner().iter().map(|(&k, v)| {
-            (k, if let Value::Builtins = v {
-                Value::AttrSet(new.clone())
-            } else {
-                v.clone()
-            })
-        }).collect());
+        let map = Rc::new(
+            new.as_inner()
+                .iter()
+                .map(|(&k, v)| {
+                    (
+                        k,
+                        if let Value::Builtins = v {
+                            Value::AttrSet(new.clone())
+                        } else {
+                            v.clone()
+                        },
+                    )
+                })
+                .collect(),
+        );
         let last = Some(
             Env {
                 last: self.last.clone(),
diff --git a/src/vm/mod.rs b/src/vm/mod.rs
index 70c8bfb..7b18ca4 100644
--- a/src/vm/mod.rs
+++ b/src/vm/mod.rs
@@ -1,5 +1,5 @@
-use std::cell::RefCell;
 use hashbrown::{HashMap, HashSet};
+use std::cell::RefCell;
 use std::pin::Pin;
 
 use crate::builtins::env;