id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12366	useless `struct identity` in rule.hpp	cppljevans@…	Joel de Guzman	"Grepping for identity in:

https://github.com/boostorg/spirit/blob/develop/include/boost/spirit/home/x3/nonterminal/rule.hpp

got only 1 hit.  Shouldn't it be removed if there no use for it?
"	Bugs	closed	To Be Determined	spirit	Boost 1.61.0	Cosmetic	fixed