db24f770ca8ccdeb538bd6ebf127006fc644d39f
errors.As calls SignalError.As when it cannot match the concrete type directly, e.g. for `var target SignalError; errors.As(err, &target)`. The previous implementation matched target's type and returned true but never wrote to it, so callers got a successful errors.As result with a zero-valued SignalError and no indication the signal was lost. Add a regression test asserting the target is actually populated.
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