error on warnings (#3612)

2 files changed, 3 insertions, 1 deletions

diff --git a/core/isolate.rs b/core/isolate.rs
index 7386aad14..de269e500 100644
--- a/core/isolate.rs
+++ b/core/isolate.rs
@@ -715,7 +715,7 @@ impl Isolate {
   #[allow(dead_code)]
   pub fn run_microtasks(&mut self) {
     let isolate = self.isolate_.as_mut().unwrap();
-    let mut locker = v8::Locker::new(isolate);
+    let _locker = v8::Locker::new(isolate);
     isolate.enter();
     isolate.run_microtasks();
     isolate.exit();
diff --git a/core/lib.rs b/core/lib.rs
index 20f3dba86..021ede9cc 100644
--- a/core/lib.rs
+++ b/core/lib.rs
@@ -1,4 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+#![deny(warnings)]
+
 #[macro_use]
 extern crate log;
 extern crate futures;