Tests

Unify empty context fallback in assignments #20945

Job	Run time
Test suite with py312-ubuntu	6m 35s
Test mypyc suite with 32-bit Python	6m 39s
Test suite with py311-ubuntu	6m 35s
Test suite with py314-windows-64	6m 32s
Test suite with py314-ubuntu, mypyc-compiled	1m 1s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 12s
Test suite with py310-ubuntu, mypyc-compiled	1m 12s
Parallel tests with py314-windows-64, interpreted	6m 27s
Test suite with py313-ubuntu, mypyc-compiled	1m 5s
mypyc runtime tests with py310-ubuntu	5m 30s
Test suite with py314t-ubuntu, mypyc-compiled	1m 17s
Type check our own code (py310-windows-64)	2m 34s
mypyc runtime tests with py313-macos	5m 17s
Type check our own code (py310-ubuntu)	1m 41s
Parallel tests with py314-ubuntu, interpreted	6m 35s
Formatting and code style with Black + ruff	1m 59s
	1h 2m 11s

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