https://stackoverflow.com/questions/16727112
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RussianNo, nothing like this will work with core macros.
The reason is that both binding and let (and friends, e.g. with-bindings) do just one thing. In the case of binding, that thing is installing thread-local bindings for Vars; for let, it is introducing local bindings. These are entirely different operations.
In let, destructuring has a clear meaning: it introduces new locals, which is exactly what the basic, non-destructuring let bindings do. This is also clearly useful, as prying appart data structures and binding different parts to different locals is a common need. The names of the locals are also locally determined, so things like :keys in associative destructuring work well.
In binding, to be consistent with its main purpose, destructuring would need to bind several Vars simultaneously to several parts of a data structure. This is not nearly as useful. If instead destructuring in binding were to introduce locals, then all of a sudden binding would do two unrelated things, possibly both in the same binding pair (note how the failing binding form from the question text expects the bindings introduced by :keys to be locals, but the binding made by :as to be the usual thread-local binding of a Var). Thus binding simply opts not to support destructuring. (If you need to bind parts of a data structure to several Vars, you can use a let to perform the destructuring, then install the bindings with binding.)
As for destructuring-bind, it's basically the destructuring-enabled version of let in Common Lisp. CL's let does not support destructuring.
