diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
index 539ecfbb42e2c..a11f81b55bb84 100644
--- a/compiler/rustc_errors/src/diagnostic.rs
+++ b/compiler/rustc_errors/src/diagnostic.rs
@@ -1325,7 +1325,7 @@ impl<'a, G: EmissionGuarantee> Diag<'a, G> {
             ));
             self.note("consider using `--verbose` to print the full type name to the console");
         }
-        Box::into_inner(self.diag.take().unwrap())
+        *self.diag.take().unwrap()
     }
 
     /// This method allows us to access the path of the file where "long types" are written to.
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index f8e19e5077893..bd421a441f95c 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -12,7 +12,6 @@
 #![feature(array_windows)]
 #![feature(assert_matches)]
 #![feature(associated_type_defaults)]
-#![feature(box_into_inner)]
 #![feature(box_patterns)]
 #![feature(default_field_values)]
 #![feature(error_reporter)]