Switch to Unspecified

Author: botahamec

clippy_lints/src/unnecessary_box_returns.rs

@@ -73,8 +73,8 @@ impl LateLintPass<'_> for UnnecessaryBoxReturns {
                 format!("function returns `Box<{boxed_ty}>` when `{boxed_ty}` implements `Sized`").as_str(),
                 "change the return type to",
                 boxed_ty.to_string(),
-                // the return value also needs to be changed, so this can't be MachineApplicable
-                Applicability::HasPlaceholders,
+                // the return value and function callers also needs to be changed, so this can't be MachineApplicable
+                Applicability::Unspecified,
             );
         }
     }