fixed import error #629

Job	Run time
downgrade (1.10, downstream)	18s
downgrade (1.10, misc)	19s
downgrade (1.10, core)	18s
downgrade (1.10, wrappers)	20s
test (core, 1.10, ubuntu-latest)	16m 2s
test (core, 1.10, macos-latest)	23m 53s
test (core, 1, ubuntu-latest)	27m 13s
test (downstream, 1.10, macos-latest)	7m 16s
test (core, 1, macos-latest)	36m 50s
test (core, pre, ubuntu-latest)	29m 21s
test (core, pre, macos-latest)	21m 16s
test (downstream, pre, macos-latest)	21m 56s
test (wrappers, 1, ubuntu-latest)	17m 59s
test (downstream, 1, macos-latest)	13m 18s
test (downstream, 1.10, ubuntu-latest)	10m 41s
test (wrappers, 1, macos-latest)	13m 33s
test (downstream, 1, ubuntu-latest)	22m 22s
test (misc, 1.10, ubuntu-latest)	7m 50s
test (misc, 1, ubuntu-latest)	19m 7s
test (wrappers, pre, ubuntu-latest)	28m 34s
test (wrappers, 1.10, macos-latest)	7m 16s
test (misc, pre, ubuntu-latest)	28m 42s
test (misc, 1.10, macos-latest)	6m 35s
test (wrappers, pre, macos-latest)	21m 11s
test (misc, pre, macos-latest)	20m 44s
test (downstream, pre, ubuntu-latest)	29m 1s
test (wrappers, 1.10, ubuntu-latest)	8m 46s
test (misc, 1, macos-latest)	17m 33s
	7h 38m 14s

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