Tests

Check functions with constrained type variable parameters for unreachability. #21286

Job	Run time
Test mypyc suite with 32-bit Python	10m 39s
mypyc runtime tests with py310-ubuntu	6m 9s
Test suite with py314-ubuntu, mypyc-compiled	14m 49s
Test suite with py311-ubuntu	8m 36s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 51s
Formatting and code style with Black + ruff	1m 58s
Type check our own code (py310-ubuntu)	1m 48s
Type check our own code (py310-windows-64)	2m 38s
Test suite with py314t-ubuntu, mypyc-compiled	16m 51s
Test suite with py313-ubuntu, mypyc-compiled	14m 4s
Test suite with py310-ubuntu, mypyc-compiled	15m 17s
mypyc runtime tests with py313-macos	4m 3s
Parallel tests with py314-windows-64, interpreted	11m 55s
Test suite with py314-windows-64	28m 9s
Test suite with py312-ubuntu	9m 3s
Parallel tests with py314-ubuntu, interpreted	25m 17s
	3h 19m 7s

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