add support for `out` keyword #343

Job	Run time
build_linux (3.9)	2m 40s
build_linux (3.10)	2m 38s
build_windows (3.9)	14m 30s
build_linux (3.11)	2m 27s
build_linux (3.12)	2m 24s
build_windows (3.10)	32m 55s
build_windows (3.11)	14m 29s
build_windows (3.12)	17m 9s
test_linux (3.9, false, ubuntu-latest)	1m 15s
test_linux (3.10, false, ubuntu-latest)	1m 14s
test_linux (3.11, false, ubuntu-latest)	1m 33s
test_linux (3.12, false, ubuntu-latest)	1m 25s
test_windows (3.9, false, windows-2019)	4m 41s
test_windows (3.10, false, windows-2019)	5m 57s
test_windows (3.11, false, windows-2019)	4m 11s
test_windows (3.12, false, windows-2019)	4m 18s
	1h 53m 46s

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