test

Migrate to doc_auto_cfg #94

Job	Run time
test (stable, 0.4.4, build)	1m 8s
test (stable, 0.5.2, build)	1m 15s
test (stable, 1.0.3, build)	1m 4s
test (stable, 1.1.0, build)	1m 12s
test (stable, 1.2.0, build)	1m 7s
test (stable, 1.4.0, build)	1m 19s
test (stable, 1.5.0, build)	1m 25s
test (stable, 1.3.2, distr)	29s
test (stable, 1.5.0, bundled)	3m 50s
test (1.31.0, 1.5.0, build)	2m 45s
test (beta, 1.5.0, build)	1m 27s
test (nightly, 1.5.0, build)	1m 30s
test (nightly, 1.5.0, build, extern-types,)	1m 33s
	20m 4s

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