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-rw-r--r--compiler/rustc_interface/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_interface/src/lib.rs b/compiler/rustc_interface/src/lib.rs
index fe40c615f79..88d2efe96d1 100644
--- a/compiler/rustc_interface/src/lib.rs
+++ b/compiler/rustc_interface/src/lib.rs
@@ -4,6 +4,7 @@
 #![feature(nll)]
 #![feature(generator_trait)]
 #![feature(generators)]
+#![feature(once_cell)]
 #![recursion_limit = "256"]
 
 mod callbacks;