This destructuring on sequences works:

user=> (let [[:as m] [1 2]] m)
[1 2]

but this one on associations doesn't (and it seems like it should):

user=> (let [{:as m} {:b 1 :c 2}] m)

java.lang.NullPointerException
clojure.lang.Compiler$CompilerException: NO_SOURCE_FILE:14: null
......

Is there a principled reason for this that I'm overlooking?

Note that a slight modification does work as I would expect:

user=> (let [{d :b :as m} {:b 1 :c 2}] m)
{:b 1, :c 2}
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