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-rw-r--r--src/librustc_codegen_utils/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustc_codegen_utils/lib.rs b/src/librustc_codegen_utils/lib.rs
index 1a3914e6ef4..330cfe154e3 100644
--- a/src/librustc_codegen_utils/lib.rs
+++ b/src/librustc_codegen_utils/lib.rs
@@ -16,6 +16,7 @@
 #![recursion_limit="256"]
 
 #![deny(rust_2018_idioms)]
+#![cfg_attr(not(stage0), deny(internal))]
 
 #[macro_use]
 extern crate rustc;