I think it is due to the fact that [1 2 3] is self-evaluating.
If you were to write
(defn f [x] ^{:order :ascending} x)
(f [1 2 3])
the data would be on x in the compiler but never on [1 2 3]
with-meta would do the right thing.
On Mon, Nov 22, 2010 at 3:57 PM, Mike K <mbk.li...@gmail.com> wrote:
> In "Programming Clojure" Stuart Halloway says:
>
> It is important to note that the metadata reader macro is not the same
> as with-meta. The metadata reader macro adds metadata for the
> compiler, and with-meta adds metadata for your own data:
>
> (def ^{:testdata true} foo (with-meta [1 2 3] {:order :ascending}))
>
> (Note: example changed to 1.2 style syntax)
>
> He then shows the difference between (meta foo) and (meta #'foo).
>
>
> However, it looks like I can accomplish the same thing with
>
> (def ^{:testdata true} foo2 ^{:order :ascending} [1 2 3])
>
> So, is there really any difference between with-data and the reader
> macro?
>
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