"ENSURE-SIGNAL-ID" "SIGNAL-LIST-NAMES" "SIGNAL-LOOKUP"
"SIGNAL-LIST-IDS" "DESCRIBE-SIGNAL" "DEFINE-SIGNAL-HANDLER"
"CALL-NEXT-HANDLER" "MAKE-CALLBACK-CLOSURE"
"ENSURE-SIGNAL-ID" "SIGNAL-LIST-NAMES" "SIGNAL-LOOKUP"
"SIGNAL-LIST-IDS" "DESCRIBE-SIGNAL" "DEFINE-SIGNAL-HANDLER"
"CALL-NEXT-HANDLER" "MAKE-CALLBACK-CLOSURE"