chore: cargo clippy

src/vm/env.rs

@@ -51,7 +51,7 @@ impl<'jit, 'vm> LetEnv<'jit, 'vm> {
                 }
             }
         }
-        self.last.as_ref().map(|env| env.lookup(symbol)).flatten()
+        self.last.as_ref().and_then(|env| env.lookup(symbol))
     }
 
     pub fn enter_arg(self: Rc<Self>, ident: usize, val: Value<'jit, 'vm>) -> Rc<Self> {
@@ -82,7 +82,7 @@ impl<'jit, 'vm> LetEnv<'jit, 'vm> {
             })
             .collect::<HashMap<_, _>>();
         let map = Env::Let(AttrSet::new(map).into());
-        let last = Some(self.into());
+        let last = Some(self);
         LetEnv { last, map }.into()
     }
 
@@ -96,7 +96,7 @@ impl<'jit, 'vm> WithEnv<'jit, 'vm> {
         if let Some(val) = self.map.select(symbol) {
             return Some(val);
         }
-        self.last.as_ref().map(|env| env.lookup(symbol)).flatten()
+        self.last.as_ref().and_then(|env| env.lookup(symbol))
     }
 
     pub fn enter_with(self, new: Rc<AttrSet<'jit, 'vm>>) -> Self {