include return flag inside panic #2871

Job	Run time
check serde	20s
check no-default-features	14s
check std	17s
clippy	1m 5s
docs	1m 35s
fmt	16s
test stable --no-default-features	51s
test no_std	19s
test stable	1m 0s
test stable --all-features	1m 29s
test beta --no-default-features	48s
test beta	47s
test beta --all-features	1m 10s
test nightly --no-default-features	2m 1s
test nightly	2m 12s
test nightly --all-features	2m 13s
	16m 37s

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