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-rw-r--r--compiler/rustc_expand/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_expand/src/lib.rs b/compiler/rustc_expand/src/lib.rs
index bcccb04c9ef..1a93975533d 100644
--- a/compiler/rustc_expand/src/lib.rs
+++ b/compiler/rustc_expand/src/lib.rs
@@ -1,3 +1,4 @@
+#![feature(bool_to_option)]
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
 #![feature(destructuring_assignment)]