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-rw-r--r--src/propspec.lisp9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/propspec.lisp b/src/propspec.lisp
index 525429b..3a8682f 100644
--- a/src/propspec.lisp
+++ b/src/propspec.lisp
@@ -228,6 +228,15 @@ systems."
`(silent-seqprops ,firstp ,secondp)
(or firstp secondp)))))
+(defmethod append-propspecs ((first null) (second unpreprocessed-propspec))
+ second)
+
+(defmethod append-propspecs ((first unpreprocessed-propspec) (second null))
+ first)
+
+(defmethod append-propspecs ((first null) (second null))
+ nil)
+
(defmethod eval-propspec ((propspec preprocessed-propspec))
(eval (slot-value propspec 'preprocessed-propspec-expression)))