Harden stack corruption fix during interruption #3992
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Resolves #3977.
The problem was that we could discard folds during interruption and then enter an uninterruptible region that catches the interruption. At that point, even though we discarded folds, we still carried along the full cause which is probably not typed correctly.
The fix just moves the typed failure stripping out of the
ifthat branches on whether the failure was caught or not.