Demonstrate lazy scheduling - #754

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`data` shadows a previous, unrelated binding

`data` shadows a previous, unrelated binding

`data` shadows a previous, unrelated binding

replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`

`internal` shadows a previous, unrelated binding

`diff` shadows a previous, unrelated binding

`time` shadows a previous, unrelated binding

`diff` shadows a previous, unrelated binding

`time` shadows a previous, unrelated binding