^ was deprecated in 1.1 as per release note below

The ^ reader macro has been deprecated as a shortcut for meta in the
hopes that it can eventually replace the #^ reader macro.
On Jun 18, 2010, at 2:20 AM, Howard Lewis Ship <hls...@gmail.com> wrote:

> I've noticed a few issues upgrading from 1.1 to 1.2; I see that ^coll
> is no longer supporter; you now have to use (meta coll) instead.
> 
> Some of the notes on new 1.2 features imply that ^ has changed
> meaning; it now looks like it's the type hint, rather than #^ ?  Is
> this true?  I've checked around for the documentation but haven't seen
> much.

> 

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