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Fix typevar default swapping with defaults#19447
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ilevkivskyi pushed a commit that referenced this pull requestOct 27, 2025
-Fixes#19444. (added `testTypeVarDefaultsSwap`)-Fixes#19362 (added `testTypeVarDefaultsSwap2`)Changed the logic for recursion guards of `TypeVarType`: Instead ofalways substituting `repl = repl.accept(self)`, and situationallyupdating `repl.default = repl.default.accept(self)` if the result is a`TypeVarType`, we now always update `repl.default =repl.default.accept(self)` a priori and then only choose the expanded`repl.accept(self)` if the result is a concrete type.## New Tests- `testTypeVarDefaultsSwap`(https://mypy-play.net/?mypy=1.17.0&python=3.12&gist=d5a025a31ae3c8b9e2a36f4738aa1991)- `testTypeVarDefaultsSwap2`(https://mypy-play.net/?mypy=1.17.0&python=3.12&gist=d3ed42c82f7144967c97d846c4c041ef)PS: closed earlier PRs#19447, since it contained debugging changes, and#19448 because it didn't solve#19362.
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testTypeVarDefaultsSwapMy idea is that we should only return the result of
repl = repl.accept(self)if that result is no longer aTypeVarType, because if we are simply permuting the type variables, then this will be incorrect.