diff --git a/dust-lang/src/chunk.rs b/dust-lang/src/chunk.rs
index dfb339e..2d63d91 100644
--- a/dust-lang/src/chunk.rs
+++ b/dust-lang/src/chunk.rs
@@ -26,24 +26,16 @@ impl Chunk {
     pub fn with_data(
         instructions: Vec<(Instruction, Span)>,
         constants: Vec<Value>,
-        identifiers: Vec<Local>,
+        locals: Vec<Local>,
     ) -> Self {
         Self {
             instructions,
             constants: constants.into_iter().map(Some).collect(),
-            locals: identifiers,
+            locals,
             scope_depth: 0,
         }
     }
 
-    pub fn len(&self) -> usize {
-        self.instructions.len()
-    }
-
-    pub fn is_empty(&self) -> bool {
-        self.instructions.is_empty()
-    }
-
     pub fn scope_depth(&self) -> usize {
         self.scope_depth
     }
@@ -79,7 +71,7 @@ impl Chunk {
             })
     }
 
-    pub fn use_constant(&mut self, index: usize, position: Span) -> Result<Value, ChunkError> {
+    pub fn take_constant(&mut self, index: usize, position: Span) -> Result<Value, ChunkError> {
         self.constants
             .get_mut(index)
             .ok_or_else(|| ChunkError::ConstantIndexOutOfBounds { index, position })?
@@ -99,12 +91,6 @@ impl Chunk {
         }
     }
 
-    pub fn contains_identifier(&self, identifier: &Identifier) -> bool {
-        self.locals
-            .iter()
-            .any(|local| &local.identifier == identifier)
-    }
-
     pub fn get_local(&self, index: usize, position: Span) -> Result<&Local, ChunkError> {
         self.locals
             .get(index)
@@ -181,20 +167,6 @@ impl Chunk {
         self.scope_depth -= 1;
     }
 
-    pub fn clear(&mut self) {
-        self.instructions.clear();
-        self.constants.clear();
-        self.locals.clear();
-    }
-
-    pub fn identifiers(&self) -> &[Local] {
-        &self.locals
-    }
-
-    pub fn pop_identifier(&mut self) -> Option<Local> {
-        self.locals.pop()
-    }
-
     pub fn disassembler<'a>(&'a self, name: &'a str) -> ChunkDisassembler<'a> {
         ChunkDisassembler::new(name, self)
     }
diff --git a/dust-lang/src/vm.rs b/dust-lang/src/vm.rs
index 4994f01..81250cc 100644
--- a/dust-lang/src/vm.rs
+++ b/dust-lang/src/vm.rs
@@ -50,7 +50,7 @@ impl Vm {
                 Operation::LoadConstant => {
                     let to_register = instruction.destination as usize;
                     let from_constant = u16::from_le_bytes(instruction.arguments) as usize;
-                    let value = self.chunk.use_constant(from_constant, position)?;
+                    let value = self.chunk.take_constant(from_constant, position)?;
 
                     self.insert(value, to_register, position)?;
                 }
@@ -156,11 +156,19 @@ impl Vm {
 
     fn clone(&mut self, index: usize, position: Span) -> Result<Value, VmError> {
         if let Some(register) = self.register_stack.get_mut(index) {
-            if let Some(value) = register.take() {
-                Ok(register.insert(value.into_reference()).clone())
+            let cloneable = if let Some(value) = register.take() {
+                if value.is_raw() {
+                    value.into_reference()
+                } else {
+                    value
+                }
             } else {
-                Err(VmError::EmptyRegister { index, position })
-            }
+                return Err(VmError::EmptyRegister { index, position });
+            };
+
+            *register = Some(cloneable.clone());
+
+            Ok(cloneable)
         } else {
             Err(VmError::RegisterIndexOutOfBounds { position })
         }
@@ -182,7 +190,7 @@ impl Vm {
         if let Ok(value) = self.take(index, position) {
             Ok(value)
         } else {
-            let value = self.chunk.use_constant(index, position)?;
+            let value = self.chunk.take_constant(index, position)?;
 
             Ok(value)
         }