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-rw-r--r--src/libproc_macro/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index 2d5bd7e872b..f960bdecc57 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -26,6 +26,7 @@
 #![feature(in_band_lifetimes)]
 #![feature(negative_impls)]
 #![feature(optin_builtin_traits)]
+#![feature(restricted_std)]
 #![feature(rustc_attrs)]
 #![feature(min_specialization)]
 #![recursion_limit = "256"]