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-rw-r--r--compiler/rustc_session/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_session/src/lib.rs b/compiler/rustc_session/src/lib.rs
index d002f597391..36bf8634c6e 100644
--- a/compiler/rustc_session/src/lib.rs
+++ b/compiler/rustc_session/src/lib.rs
@@ -1,6 +1,7 @@
 #![feature(crate_visibility_modifier)]
 #![feature(once_cell)]
 #![feature(or_patterns)]
+#![feature(str_split_once)]
 
 #[macro_use]
 extern crate bitflags;