derived Show for labelled fields: use comma as separator, not comma followed by space
| otherwise = --Assumption: no of fields == no of labelled fields
-- (and in same order)
concat $
- intersperse ([mk_showString_app (_CONS_ ',' SLIT(" "))]) $ -- Using SLIT()s containing ,s spells trouble.
+ intersperse ([mk_showString_app (_CONS_ ',' _NIL_)]) $ -- Using SLIT()s containing ,s spells trouble.
zipWithEqual "gen_Show_binds"
(\ a b -> [a,b])
(map show_label labels)