Correcting myself:

really working method how to change an element of a block to any
Rebol value is:

     change copy [element] insert/only copy []  get/any 'value

the previous method didn't work for errors.

> Hi,
>
> {8^D
>
> although it looked useless at a first glance, it really is a
way,
> how to change an element of a block to any value:
>
>     change copy [element] reduce [get/any 'value]
>


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