Fix swapping TypeVars with defaults. #19449
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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testTypeVarDefaultsSwap)overrideerror when subclassing with multiple typevars with defaults #19362 (addedtestTypeVarDefaultsSwap2)Changed the logic for recursion guards of
TypeVarType: Instead of always substitutingrepl = repl.accept(self), and situationally updatingrepl.default = repl.default.accept(self)if the result is aTypeVarType, we now always updaterepl.default = repl.default.accept(self)a priori and then only choose the expandedrepl.accept(self)if the result is a concrete type.PS: closed earlier PRs #19447, since it contained debugging changes and #19448 because it didn't solve #19362.