Tests

Avoid narrowing to unreachable at module level #21489

Job	Run time
Test mypyc suite with 32-bit Python	10m 35s
Test suite with py314-ubuntu, mypyc-compiled	16m 46s
Test suite with py312-ubuntu	10m 11s
Test suite with py310-ubuntu, mypyc-compiled	16m 8s
Test suite with py311-ubuntu	9m 28s
Type check our own code (py310-windows-64)	2m 37s
mypyc runtime tests with py310-ubuntu	6m 33s
mypyc runtime tests with py313-macos	5m 36s
Test suite with py314t-ubuntu, mypyc-compiled	16m 50s
Parallel tests with py314-windows-64, interpreted	10m 30s
Type check our own code (py310-ubuntu)	1m 43s
Formatting and code style with Black + ruff	1m 58s
Test suite with py313-ubuntu, mypyc-compiled	16m 35s
Parallel tests with py314-ubuntu, mypyc-compiled	16m 47s
Test suite with py314-windows-64	16m 39s
Parallel tests with py314-ubuntu, interpreted	16m 47s
	2h 55m 43s

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