Support complex macros. #1955

Job	Run time
minimal	15s
msrv	4m 24s
docs	26s
check-cfg	25s
quickchecking	23s
rustfmt-clippy	33s
test-book	6s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 57s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	1m 53s
test-expectations (ubuntu-latest)	58s
test-expectations (macos-latest)	2m 18s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 58s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 59s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 27s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 34s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 32s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 54s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	2m 45s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	3m 1s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	2m 46s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	2m 47s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	3m 6s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	3m 10s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	3m 5s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	3m 17s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 58s
test (macos-latest, 9.0, 0, 0, 0)	2m 21s
success	1s
	56m 19s

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