(result));
            @assert(typeof result.done === "boolean");
            if (result.done && !teeState.closedOrErrored) {
                if (!teeState.canceled1)
                    @readableStreamDefaultControllerClose(teeState.branch1.@readableStreamController);
                if (!teeState.canceled2)
                    @readableStreamDefaultControllerClose(teeState.branch2.@readableStreamController);
                teeState.closedOrErrored = true;
                if (!teeState.canceled1 || !teeState.canceled2)
                    teeState.cancelPromiseCapability.@resolve.@call();
            }
            if (teeState.closedOrErrored)
                return;
            if (!teeState.canceled1)
                @readableStreamDefaultControllerEnqueue(teeState.branch1.@readableStreamController, result.value);
            if (!teeState.canceled2)
                @readableStreamDefaultControllerEnqueue(teeState.branch2.@readableStreamController, shouldClone ? @structuredCloneForStream(result.value) : result.value);
        });
    }
})