Regression in the error from "None % 'ra'"
This used to give "TypeError: expected str, got NoneType object"
(which is close to CPython's "TypeError: unsupported operand type(s) for %: 'NoneType' and 'str'"
. But on py3.8 HEAD it results in "TypeError: not all arguments converted during string formatting"
.
This happened when merging 571640136f05 (which does not have this problem) into py3.8 in 75a7db3fc2ec (where suddenly the error changes).