Backport "Revert addition of new base trait to ReturnThrowable" to 3.8.1 #25015
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The deprecated class NonLocalReturns.ReturnThrowable acquired a new base type `caps.Control` in 3.8. That was a mistake. Later versions of the capture checker reject that inheritance since `ReturnThrowable` is an exception and therefore must be a pure class, whereas inheriting `caps.Control` would automatically add a capture set to that class. It's too late to revert for 3.8, but we should revert for 3.8.1. It's technically a backwards incompatible change, but I would be extremely surprised if anyone has used ReturnThrowable as a caps.Control in the 3.8.0 window. [Cherry-picked 5924e08][modified]
sjrd
approved these changes
Jan 20, 2026
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No regressions detected in the community build up to release-3.8.1_backport-25008. |
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Backports #24975 to the 3.8.1 (hotfix).
PR submitted by the release tooling.
Would also be backported to 3.8.2-RC2 (successor of 3.8.1-RC1)