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-rw-r--r--src/libsyntax/lib.rs1
1 files changed, 0 insertions, 1 deletions
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index bb6a8dfb141..5ef80518b40 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -7,7 +7,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/",
        test(attr(deny(warnings))))]
 
-#![deny(rust_2018_idioms)]
 #![deny(unused_lifetimes)]
 
 #![feature(bind_by_move_pattern_guards)]