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-rw-r--r--compiler/rustc_macros/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_macros/src/lib.rs b/compiler/rustc_macros/src/lib.rs
index 904f8eb5731..f4593d0fe73 100644
--- a/compiler/rustc_macros/src/lib.rs
+++ b/compiler/rustc_macros/src/lib.rs
@@ -7,6 +7,7 @@
 #![allow(rustc::default_hash_types)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
+#![cfg_attr(not(bootstrap), allow(internal_features))]
 #![recursion_limit = "128"]
 
 use synstructure::decl_derive;