Fix warning (#162) #546

Job	Run time
test-windows-msvc (stable-x86_64-pc-windows-msvc, false)	4m 15s
test-windows-gnu (stable-x86_64-pc-windows-gnu, false)	4m 0s
test-windows-msvc (beta-x86_64-pc-windows-msvc, false)	3m 27s
test-windows-gnu (beta-x86_64-pc-windows-gnu, false)	3m 33s
test-windows-msvc (nightly-x86_64-pc-windows-msvc, true)	3m 20s
test-linux-lts (stable, false)	2m 14s
test-windows-gnu (nightly-x86_64-pc-windows-gnu, true)	3m 44s
test-linux (stable, false)	1m 44s
test-macos (stable, false)	1m 24s
test-linux (beta, false)	2m 20s
test-macos (beta, false)	1m 28s
test-macos-lts (stable, false)	1m 14s
test-linux (nightly, true)	1m 44s
test-windows-gnu-lts (stable-x86_64-pc-windows-gnu, false)	3m 20s
test-macos (nightly, true)	1m 46s
test-windows-msvc-lts (stable-x86_64-pc-windows-msvc, false)	4m 5s
julia-module-test-macos	36s
julia-module-test-linux	1m 39s
docs	20s
julia-module-test-windows-gnu	1m 52s
	48m 5s

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