Keys for :or should be locally bound, not keywords or qualified symbols

[kennyjwilli]

bar is marked as cannot be resolved in this example:

(let [{:keys [foo/bar]
       :or   {bar 1}} {}]
  bar)

Previously you could get around this by doing:

(let [{:keys [foo/bar]
       :or   {foo/bar [1]}} {}]
  bar)

However that behavior was accidental and broken. It is removed from clojure 1.9.0. Per Alex Miller:

the keys of the :or should always be the symbols to bind locally (not keywords or qualified symbols)