Set the subcomponent of the data referred to by a lens
with a new value. See lens for details.  Merely dispatches
to the set component of the lens.
| 1 | set(d, l, x)
 | 
| d | the data, or an oscope | 
| l | the lens, or in the case of an  | 
| x | the replacement value, or nothing in the case of an  | 
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