add use statement

Author: zixuanzh

libchisel/src/lib.rs

@@ -13,6 +13,9 @@ pub mod verifyimports;
 pub mod verifyinstructions;
 mod instructionerrors;
 
+use crate::instructionerrors::*;
+use parity_wasm::elements::*;
+
 #[derive(Eq, PartialEq, Debug)]
 pub enum ModuleError {
     NotSupported,