Support complex macros. #1811

Job	Run time
rustfmt-clippy	30s
msrv	4m 57s
check-cfg	23s
minimal	20s
docs	28s
quickchecking	23s
test-expectations (ubuntu-latest)	1m 4s
test-expectations (macos-latest)	1m 33s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	1m 50s
test-book	10s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	1m 51s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	1m 47s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	1m 56s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	3m 14s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	2m 24s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	2m 18s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	2m 18s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	2m 11s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 23s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	2m 24s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 11s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 37s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 38s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 47s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 30s
test (ubuntu-latest, 9.0, 0, 0, 1)	1m 19s
test (macos-latest, 9.0, 0, 0, 0)	2m 6s
	50m 32s

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