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-rw-r--r--src/libproc_macro/lib.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index f962c888f42..867fa48330d 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -125,6 +125,10 @@ pub mod __internal {
         fn register_attr_proc_macro(&mut self,
                                     name: &str,
                                     expand: fn(TokenStream, TokenStream) -> TokenStream);
+
+        fn register_bang_proc_macro(&mut self,
+                                    name: &str,
+                                    expand: fn(TokenStream) -> TokenStream);
     }
 
     // Emulate scoped_thread_local!() here essentially