optimize: dedup consts

src/ty/internal/cnst.rs

@@ -1,3 +1,5 @@
+use std::hash::Hash;
+
 use derive_more::{IsVariant, Unwrap};
 use ecow::EcoString;
 
@@ -7,6 +9,20 @@ pub enum Const {
     Int(i64),
     Float(f64),
     String(EcoString),
+    Null
+}
+
+impl Hash for Const {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        use Const::*;
+        match self {
+            Int(x) => x.hash(state),
+            Float(x) => x.to_bits().hash(state),
+            Bool(x) => x.hash(state),
+            String(x) => x.hash(state),
+            x @ Null => x.hash(state),
+        }
+    }
 }
 
 impl From<bool> for Const {

src/ty/internal/func.rs

@@ -89,7 +89,7 @@ impl<'vm> Func<'vm> {
             }
         }
 
-        vm.eval(self.func.opcodes.clone(), env)
+        vm.eval(self.func.opcodes.iter().copied(), env)
     }
 }
 

src/ty/internal/mod.rs

@@ -458,7 +458,7 @@ impl<'vm> Thunk<'vm> {
             _Thunk::SuspendedFrom(self as *const Thunk),
         )
         .unwrap_code();
-        let value = vm.eval(opcodes.clone(), env.get().unwrap().clone())?;
+        let value = vm.eval(opcodes.iter().copied(), env.get().unwrap().clone())?;
         let _ = std::mem::replace(
             &mut *self.thunk.borrow_mut(),
             _Thunk::Value(value.clone().into()),