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> Or maybe an alias operator that allows you to create temporary local names
> for variables:-
>   ?x = longVarName?x + 1    -- read longVarName?a as "longVarName which we
> will call x"

Aliases in the form
	alias x=longVarName, y=AnotherLongVarName
are trivial to implement with token filters (though respecting scopes will
need some real work).