diff --git a/dust-lang/src/native_function/logic.rs b/dust-lang/src/native_function/logic.rs
index e414743..95395c0 100644
--- a/dust-lang/src/native_function/logic.rs
+++ b/dust-lang/src/native_function/logic.rs
@@ -1,6 +1,6 @@
 use std::io::{self, stdout, Write};
 
-use crate::{Instruction, NativeFunctionError, Span, Value, Vm, VmError};
+use crate::{Instruction, NativeFunctionError, Value, Vm, VmError};
 
 pub fn panic(vm: &Vm, instruction: Instruction) -> Result<Option<Value>, VmError> {
     let argument_count = instruction.c();
diff --git a/dust-lang/src/value/mod.rs b/dust-lang/src/value/mod.rs
index 16848c2..5324d98 100644
--- a/dust-lang/src/value/mod.rs
+++ b/dust-lang/src/value/mod.rs
@@ -251,7 +251,7 @@ impl Clone for Value {
             Value::Function(function) => Value::Function(function.clone()),
             Value::Integer(integer) => Value::Integer(*integer),
             Value::List(list) => Value::List(list.clone()),
-            Value::Range(range) => Value::Range(range.clone()),
+            Value::Range(range) => Value::Range(*range),
             Value::String(string) => Value::String(string.clone()),
         }
     }
diff --git a/dust-lang/src/vm.rs b/dust-lang/src/vm.rs
index ce13c64..8f76371 100644
--- a/dust-lang/src/vm.rs
+++ b/dust-lang/src/vm.rs
@@ -616,7 +616,7 @@ impl<'a> Vm<'a> {
 }
 
 #[derive(Clone, Debug, PartialEq)]
-enum Register {
+pub enum Register {
     Empty,
     Value(Value),
     Pointer(Pointer),