Tests

infer return types #1937

Job	Run time
Test suite with py38-ubuntu, mypyc-compiled	24m 13s
Test mypyc suite with 32-bit Python	7m 19s
Test suite with py38-windows-64	31m 25s
Test suite with py39-ubuntu	30m 56s
Test suite with py310-ubuntu	30m 0s
Test suite with py311-ubuntu, mypyc-compiled	22m 10s
Test suite with py312-ubuntu, mypyc-compiled	23m 59s
Test suite with py313-ubuntu, mypyc-compiled	23m 25s
mypyc runtime tests with py39-macos	4m 36s
Type check our own code (py38-ubuntu)	4m 28s
Type check our own code (py38-windows-64)	4m 28s
Formatting and code style with Black + ruff	1m 0s
	3h 27m 59s

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