Be clearer in our error messages, #'canonicalize-inst-pair, #'canonicalize-spec lisp/ChangeLog addition: 2010-08-15 Aidan Kehoe <kehoea@parhasard.net> * specifier.el (canonicalize-inst-pair, canonicalize-spec): If a specifier tag set is correct, but an instantiator is not in an accepted format, don't error with the message "Invalid specifier tag set". Also, when we error, use error-symbols, for better structured error handling and more ease when testing. tests/ChangeLog addition: 2010-08-15 Aidan Kehoe <kehoea@parhasard.net> * automated/lisp-tests.el: (not, not, invalid-argument, invalid-argument): Check that error messages from the image specifier instantiator code are clearer than they used to be.

--- a/lisp/ChangeLog	Sun Aug 15 13:29:10 2010 +0100
+++ b/lisp/ChangeLog	Sun Aug 15 15:42:45 2010 +0100
@@ -1,3 +1,12 @@
+2010-08-15  Aidan Kehoe  <kehoea@parhasard.net>
+
+	* specifier.el (canonicalize-inst-pair, canonicalize-spec):
+	If a specifier tag set is correct, but an instantiator is not in
+	an accepted format, don't error with the message "Invalid
+	specifier tag set".
+	Also, when we error, use error-symbols, for better structured
+	error handling and more ease when testing.
+
 2010-07-24  Aidan Kehoe  <kehoea@parhasard.net>
 
 	* cl-extra.el (concatenate):