diff --git a/src/lib.rs b/src/lib.rs
index 50f17dd..ea075b2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,13 +3,14 @@ extern crate env_logger;
 #[macro_use] extern crate log;
 #[macro_use] extern crate lazy_static;
 
+pub mod rules;
+
 mod optimizer;
 mod gas;
 mod symbols;
 mod logger;
 mod ext;
 mod pack;
-mod rules;
 
 pub use optimizer::{optimize, Error as OptimizerError};
 pub use gas::inject_gas_counter;
diff --git a/src/rules.rs b/src/rules.rs
index f77eadc..5a7b439 100644
--- a/src/rules.rs
+++ b/src/rules.rs
@@ -3,7 +3,7 @@ use parity_wasm::elements;
 
 pub struct UnknownInstruction;
 
-#[derive(Debug, Hash, PartialEq, Eq)]
+#[derive(Debug, Hash, PartialEq, Eq, Copy, Clone)]
 pub enum InstructionType {
     Bit,
     Add,