diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 0000000..f899e66
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1,3 @@
+(setenv "RUSTFLAGS"
+        (concat (getenv "RUSTFLAGS")
+                "-A dead_code"))