add support for `out` keyword #323

Job	Run time
build_windows (3.9)	9m 0s
build_linux (3.9)	2m 30s
build_windows (3.10)	9m 59s
build_linux (3.10)	2m 35s
build_windows (3.11)	8m 26s
build_linux (3.11)	2m 37s
build_windows (3.12)	8m 27s
build_linux (3.12)	2m 25s
test_linux (3.9, false, ubuntu-latest)	2m 4s
test_linux (3.10, false, ubuntu-latest)	1m 49s
test_linux (3.11, false, ubuntu-latest)	1m 43s
test_linux (3.12, false, ubuntu-latest)	1m 22s
test_windows (3.9, false, windows-2019)	4m 44s
test_windows (3.10, false, windows-2019)	4m 19s
test_windows (3.11, false, windows-2019)	3m 53s
test_windows (3.12, false, windows-2019)	4m 9s
	1h 10m 2s

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