Detailed 'signature incompatible with supertype' for non-callables #9896

Job	Run time
Test mypyc suite with 32-bit Python	10m 4s
Test suite with py37-windows-64	32m 3s
Test suite with py38-ubuntu	22m 16s
Test suite with py39-ubuntu	21m 46s
Test suite with py37-ubuntu, mypyc-compiled	21m 37s
Test suite with py310-ubuntu, mypyc-compiled	19m 58s
Test suite with py310-ubuntu	25m 12s
Test suite with py311-ubuntu, mypyc-compiled	26m 47s
mypyc runtime tests with py37-macos	6m 55s
mypyc runtime tests with py37-debug-build-ubuntu	9m 16s
Type check our own code (py37-ubuntu)	2m 0s
Type check our own code (py37-windows-64)	3m 12s
Formatting with Black + isort and code style with flake8	1m 17s
Test suite with Python nightly	18m 5s
	3h 40m 28s

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