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diff --git a/BUGS b/BUGS
index ddd6bf7..68cbee7 100644
--- a/BUGS
+++ b/BUGS
@@ -411,6 +411,9 @@ returning an array as first value always.
   so that (TYPEP (MAKE-ARRAY 3) '(VECTOR SOMETHING-NOT-DEFINED-YET))
   returns (VALUES T T). Probably it should be an error instead,
   complaining that the type SOMETHING-NOT-DEFINED-YET is not defined.
+  Or perhaps UPGRADED-ARRAY-ELEMENT-TYPE should just fail when a type
+  isn't defined yet. (What if the definition of
+  SOMETHING-NOT-DEFINED-YET turns out to be SINGLE-FLOAT?) 
 
 41:
   TYPEP of VALUES types is sometimes implemented very inefficiently, e.g. in