I've written an implementation of this
here: https://gist.github.com/dgrnbrg/4751473
It does incur a 2 instance check penalty (the branches should be 100%
predictable, and never hurt in practice). I'm not sure if I could use
protocols to further reduce the cost of the check.
I've already put this into the util.clj in my project that needs this most,
to good effect.
David
On Friday, February 8, 2013 12:18:54 PM UTC-5, vemv wrote:
>
> Given that: a) fns can have names for debugging purposes, and b) data
> structures can have metadata, wouldn't it be a good idea to let let auto
> attach (where possible) the names of the bindings to their corresponding
> values?
>
> For example, the improved let I'm thinking of would translate this input:
>
> (ns my.namespace)
>
> (defn do-it
> (let [foo (fn [] (throw (Exception.)))
> bar {:hello (/ 0 0)}]))
>
> to:
>
> (ns my.namespace)
>
> (defn do-it
> (let [foo (fn foo [] (throw (Exception.)))
> bar ^{:origin :my.namespace/do-it$let$bar} {:hello (/ 0 0)}]))
>
> This could be used to increase the precision of the stack traces, or in
> IDEs/editors for locating the exact source of an exception.
>
> Do you see such a mechanism being incorporated to clojure.core/let -
> should I open a ticket?
>
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