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-rw-r--r--src/libsyntax_ext/lib.rs1
1 files changed, 0 insertions, 1 deletions
diff --git a/src/libsyntax_ext/lib.rs b/src/libsyntax_ext/lib.rs
index fae884860ed..21031109f2a 100644
--- a/src/libsyntax_ext/lib.rs
+++ b/src/libsyntax_ext/lib.rs
@@ -3,7 +3,6 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
 
-#![deny(rust_2018_idioms)]
 #![deny(unused_lifetimes)]
 
 #![feature(crate_visibility_modifier)]