diff --git a/Cargo.lock b/Cargo.lock
index 1d0fa502e090..2982755aa9c4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,6 +6,15 @@ dependencies = [
  "memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "derive-new"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "diff"
 version = "0.1.10"
@@ -98,6 +107,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "rustfmt-nightly"
 version = "0.2.14"
 dependencies = [
+ "derive-new 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "diff 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -242,6 +252,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
 "checksum aho-corasick 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "500909c4f87a9e52355b26626d890833e9e1d53ac566db76c36faa984b889699"
+"checksum derive-new 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "415f627ab054041c3eb748c2e1da0ef751989f5f0c386b63a098e545854a98ba"
 "checksum diff 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "0a515461b6c8c08419850ced27bc29e86166dcdcde8fbe76f8b1f0589bb49472"
 "checksum dtoa 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "09c3753c3db574d215cba4ea76018483895d7bff25a31b49ba45db21c48e50ab"
 "checksum env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3ddf21e73e016298f5cb37d6ef8e8da8e39f91f9ec8b0df44b7deb16a9f8cd5b"
diff --git a/Cargo.toml b/Cargo.toml
index 45b89d845636..3af4803bc5f3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,6 +40,7 @@ diff = "0.1"
 log = "0.3"
 env_logger = "0.4"
 getopts = "0.2"
+derive-new = "0.5"
 
 [target.'cfg(unix)'.dependencies]
 libc = "0.2.11"