Prototype implementation of recursion #585

Job	Run time
test (1.7, ubuntu-latest, x64)	51s
test (1.7, ubuntu-latest, x86)	55s
test (1.7, windows-latest, x64)	1m 4s
test (1.7, windows-latest, x86)	2m 9s
test (1.7, macOS-latest, x64)	1m 24s
test (1, ubuntu-latest, x64)	47s
test (1, ubuntu-latest, x86)	56s
test (1, windows-latest, x64)	1m 13s
test (1, windows-latest, x86)	1m 33s
test (1, macOS-latest, x64)	1m 19s
test (nightly, ubuntu-latest, x64)	1m 2s
test (nightly, ubuntu-latest, x86)	1m 26s
test (nightly, windows-latest, x64)	1m 26s
test (nightly, windows-latest, x86)	2m 7s
test (nightly, macOS-latest, x64)	1m 55s
	20m 7s

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