Hi Dan,
And, if I understand correctly, what was really happening with the macro
> bar was that in ('+ 2 'u), '+ was looking itself up in 2, not finding
> itself, and so returning the default value 'u. This was the expansion of
> the macro, and so at run time, it was bound to 10.
>
>
exactly, indeed one would expect that the list:
('+ 2 'u)
would throw an exception, since the first element does not evaluate to a
macro/function
however, Clojure allows the use of symbols (in this case, '+) as functions
that lookup themselves into the collection that follows
this special syntax does not apply to numbers:
(1 2 'u)
;=> ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn
user/eval7633 (form-init2468783434806143559.clj:1)
cheers,
Gianluca
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