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-rw-r--r--compiler/rustc_data_structures/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
index 5d42f8c9306..76ae17f28c6 100644
--- a/compiler/rustc_data_structures/src/lib.rs
+++ b/compiler/rustc_data_structures/src/lib.rs
@@ -17,6 +17,7 @@
 #![feature(generators)]
 #![feature(let_else)]
 #![feature(hash_raw_entry)]
+#![feature(hasher_prefixfree_extras)]
 #![feature(maybe_uninit_uninit_array)]
 #![feature(min_specialization)]
 #![feature(never_type)]