user=> (meta '^:k o)
{:tag :k}
How does this happen when :tag is not even in the expression?
If you launch a brand new repl and run it what happens?
On Jan 9, 5:17 pm, Meikel Brandmeyer <m...@kotka.de> wrote:
> Hi,
>
> Am 10.01.2011 um 01:10 schrieb Tim Robinson:
>
> > You must have something messed up:
>
> > In line 1 (meta ^:k []) does not return {:tag :k} it returns nil and
> > I am using Clojure 1.2.
>
> > Both lines 1 and 2, shouldn't return meta, because 'meta' only takes
> > an object as an input argument.
> > And only if the object already has metadata will metadata will return.
>
> > => (def o (with-meta ['mydatastructure] {:k []}))
> > => (meta o)
> > {:k []}
>
> Are you sure?
>
> Clojure 1.2.0
> user=> (meta '^:k o)
> {:tag :k}
> user=> (meta ^:k [])
> {:tag :k}
> user=> (meta (with-meta 'o {:tag :k}))
> {:tag :k}
> user=> (meta ^:k 'o)
> nil
>
> The ^ stuff all works in the reader. So meta always sees only one argument
> with metadata already attached. The question is: Where is the meta data
> attached?
>
> Sincerely
> Meikel
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