super.init call in variable visitor #671

Job	Run time
linux/3.8/bare-env	11s
linux/3.12	17m 23s
lint/style-and-typos	43s
osx/3.10	20m 11s
win/3.9	41m 16s
linux/3.11/conda	20m 54s
linux/3.10/mpi	8m 31s
linux/3.10/cython	21m 34s
win/3.8/pip	29m 36s
process-coverage-${{ matrix.TARGET }}	0s
	2h 40m 19s

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