diff --git a/2016/rust/Cargo.toml b/2016/rust/Cargo.toml
index 7ed1c86..7c0e8c4 100644
--- a/2016/rust/Cargo.toml
+++ b/2016/rust/Cargo.toml
@@ -7,3 +7,6 @@ authors = ["Alpha Chen <alpha.chen@gmail.com>"]
 error-chain = "0.7"
 regex = "0.1"
 rust-crypto = "0.2"
+
+[profile.release]
+debug = true
diff --git a/2016/rust/src/lib.rs b/2016/rust/src/lib.rs
index ff55076..2f3bbb7 100644
--- a/2016/rust/src/lib.rs
+++ b/2016/rust/src/lib.rs
@@ -1,10 +1,11 @@
-#![feature(field_init_shorthand, inclusive_range_syntax)]
+#![feature(alloc_system, field_init_shorthand, inclusive_range_syntax)]
 #![recursion_limit = "1024"]
 
+extern crate alloc_system;
+extern crate crypto;
 #[macro_use]
 extern crate error_chain;
 extern crate regex;
-extern crate crypto;
 
 mod assembunny;
 pub mod errors;
diff --git a/2016/rust/src/main.rs b/2016/rust/src/main.rs
index 8eba962..a25bb1b 100644
--- a/2016/rust/src/main.rs
+++ b/2016/rust/src/main.rs
@@ -1,5 +1,6 @@
-use std::io;
-use std::io::Read;
+use std::env;
+use std::fs::File;
+use std::io::prelude::*;
 
 extern crate advent_of_code_2016;
 use advent_of_code_2016::*;
@@ -7,8 +8,10 @@ use advent_of_code_2016::errors::*;
 
 fn main() {
   run(|| {
+    let filename = env::args().nth(1).ok_or("")?;
+    let mut f = File::open(filename).chain_err(|| "")?;
     let mut input = String::new();
-    io::stdin().read_to_string(&mut input).ok();
+    f.read_to_string(&mut input).chain_err(|| "")?;
 
     let solution = day_23::solve(&input)?;
     println!("{}", solution);