Add size caching to object-size methods generated for messages without fields

[cl-protobufs.git] / upgradable.lisp

diff --git a/upgradable.lisp b/upgradable.lisp
index 8dac02700e5098dfad9b29140a6a15ad32b4ddd8..c526851a7afbc52f892e99780e78a45258321327 100644 (file)
--- a/upgradable.lisp
+++ b/upgradable.lisp
@@ -13,7 +13,9 @@
 
 ;;; Can a version of a Protobufs schema be upgraded to a new version
 
-(defvar *upgrade-warnings*)
+(defvar *upgrade-warnings* nil
+  "Bound to the list of upgrade warning messages.")
+
 (defun upgrade-warn (format-string &rest format-args)
   "Collect an upgrade warning into *upgrade-warnings*.
    Returns the list of warnings."