diff --git a/clippy_dev/src/crater.rs b/clippy_dev/src/crater.rs
index 22b04242885..1cf12941c35 100644
--- a/clippy_dev/src/crater.rs
+++ b/clippy_dev/src/crater.rs
@@ -69,7 +69,7 @@ fn build_clippy() {
 }
 
 // the main fn
-pub(crate) fn run() {
+pub fn run() {
     let cargo_clippy_path: PathBuf = PathBuf::from("target/debug/cargo-clippy");
     let clippy_driver_path: PathBuf = PathBuf::from("target/debug/cargo-driver");
 
@@ -88,7 +88,7 @@ pub(crate) fn run() {
     );
 
     // download and extract the crates, then run clippy on them and collect clippys warnings
-    let clippy_lint_results: Vec<String> = krates
+    let _clippy_lint_results: Vec<String> = krates
         .into_iter()
         .map(|krate| krate.download_and_extract())
         .map(|krate| krate.run_clippy_lints())
diff --git a/clippy_dev/src/main.rs b/clippy_dev/src/main.rs
index 2ea56c42faf..6fb8b6f2899 100644
--- a/clippy_dev/src/main.rs
+++ b/clippy_dev/src/main.rs
@@ -1,7 +1,7 @@
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 
 use clap::{App, Arg, ArgMatches, SubCommand};
-use clippy_dev::{bless, fmt, new_lint, ra_setup, serve, stderr_length_check, update_lints};
+use clippy_dev::{bless, crater, fmt, new_lint, ra_setup, serve, stderr_length_check, update_lints};
 
 fn main() {
     let matches = get_clap_config();
@@ -10,6 +10,9 @@ fn main() {
         ("bless", Some(matches)) => {
             bless::bless(matches.is_present("ignore-timestamp"));
         },
+        ("crater", Some(_)) => {
+            crater::run();
+        },
         ("fmt", Some(matches)) => {
             fmt::run(matches.is_present("check"), matches.is_present("verbose"));
         },
@@ -56,6 +59,7 @@ fn get_clap_config<'a>() -> ArgMatches<'a> {
                         .help("Include files updated before clippy was built"),
                 ),
         )
+        .subcommand(SubCommand::with_name("crater").about("run clippy on a set of crates and check output"))
         .subcommand(
             SubCommand::with_name("fmt")
                 .about("Run rustfmt on all projects and tests")