test

Add support for %type declarations using `%nterm` in Nonterminal Symbols #1437

Job	Run time
test-memory (head)	48s
test-windows (head)	1m 48s
check-misc (head)	9s
steep-check (head)	25s
test-ruby (head, master)	5m 55s
test-ruby (3.0, master)	5m 51s
ruby-versions / Generate Ruby versions	2s
test-cpp (head, g++)	12s
test (2.5)	25s
test-cpp (head, clang++)	20s
test (2.6)	27s
test (2.7)	25s
test (3.0)	14s
test (3.1)	15s
test (3.2)	15s
test (3.3)	13s
test (head)	14s
	17m 58s

Provide feedback