Tests

infer return types #1924

Job	Run time
Test mypyc suite with 32-bit Python	1m 7s
Test suite with py38-ubuntu, mypyc-compiled	1m 20s
Test suite with py38-windows-64	1m 8s
Test suite with py39-ubuntu	1m 21s
Test suite with py310-ubuntu	1m 21s
Test suite with py311-ubuntu, mypyc-compiled	1m 18s
Test suite with py312-ubuntu, mypyc-compiled	1m 18s
Test suite with py313-ubuntu, mypyc-compiled	1m 20s
mypyc runtime tests with py39-macos	1m 21s
Type check our own code (py38-ubuntu)	1m 21s
Type check our own code (py38-windows-64)	1m 5s
Formatting and code style with Black + ruff	57s
	14m 57s

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