Disclaimer: I do not make decisions on what gets into clojure.core.

Here is a page that gives some reasons why most things don't get into
clojure.core:
http://dev.clojure.org/display/design/Why+Feature+X+Was+Declined

More specifically on if-all-let and things like it, many people seem to
disagree on what they think is the most natural behavior for a variant of
if-let with multiple bindings -- whether it should be 'and' or 'or'
behavior, for example.  Obviously that doesn't preclude a well-defined
alternative from being adopted, hence the page above is probably a more
accurate answer.

Andy

On Sat, Jul 11, 2015 at 6:36 AM, crocket <crockabisc...@gmail.com> wrote:

> (defmacro if-all-let [bindings then else]
>   (reduce (fn [subform binding]
>             `(if-let [~@binding] ~subform ~else))
>           then (reverse (partition 2 bindings))))
>
> I quoted the function from p259 of "Chas Emerick, Brian Carper, Christophe
> Grand-Clojure Programming-O'Reilly Media (2012)"
> Why doesn't clojure.core adopt this?
>
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