Test with C-extensions

add example for block with multiline-attrib #2058

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Run time

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Job	Run time
build (3.9)	1m 33s
build (3.10)	1m 31s
build (3.11)	1m 28s
build (3.12)	1m 29s
build (3.13)	1m 36s
	7m 37s