Fix #520 (package/module name collision) #2409

Job	Run time
maybe-expedite	3s
lint	6m 43s
test (third-party, bincode, stable, false)	16m 53s
test (third-party, bincode, stable, true)	17m 4s
test (third-party, bincode, nightly, false)	16m 15s
test (third-party, bincode, nightly, true)	15m 43s
test (third-party, postcard, stable, false)	19m 14s
test (third-party, postcard, stable, true)	18m 40s
test (third-party, postcard, nightly, false)	16m 52s
test (third-party, postcard, nightly, true)	16m 46s
test (other, bincode, stable, false)	29m 57s
test (other, bincode, stable, true)	29m 44s
test (other, bincode, nightly, false)	36m 23s
test (other, bincode, nightly, true)	36m 40s
test (other, postcard, stable, false)	31m 11s
test (other, postcard, stable, true)	31m 2s
test (other, postcard, nightly, false)	37m 36s
test (other, postcard, nightly, true)	36m 22s
all-checks	1s
	6h 53m 9s

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