Remove extern crate notation and move hex to dev-dependencies

chisel/src/main.rs

@@ -1,17 +1,11 @@
-extern crate libchisel;
-#[macro_use]
-extern crate clap;
-extern crate serde;
-extern crate serde_derive;
-extern crate serde_yaml;
-
 #[macro_use]
 mod logger;
 mod config;
 mod driver;
 mod options;
 mod result;
 
+use clap::{crate_description, crate_name, crate_version};
 use std::fs::{read, read_to_string, write};
 use std::process;
 

libchisel/Cargo.toml

@@ -13,10 +13,12 @@ edition = "2018"
 [dependencies]
 binaryen = { version = "0.8", optional = true }
 parity-wasm = "^0.40.2"
-rustc-hex = "1.0"
 failure = "0.1.5"
 wabt = { version = "0.8.0", optional = true }
 wasm-snip = "0.2.0"
 
 [features]
 default = []
+
+[dev-dependencies]
+rustc-hex = "1.0"

libchisel/src/lib.rs

@@ -1,10 +1,3 @@
-#[cfg(feature = "binaryen")]
-extern crate binaryen;
-extern crate parity_wasm;
-extern crate rustc_hex;
-#[cfg(feature = "wabt")]
-pub extern crate wabt;
-
 pub use parity_wasm::elements::Module;
 
 use std::{error, fmt};