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*?ex-handler* (clj)
(source)variable
Dynamic var. If non-nil, will be invoked with the exception as
argument A one-argument function is excepted.
Because `clojure.walk/walk` is used for map traversal, it is not
possible to pas s down any argument. Also, as we iteratively walk
through nested data structures, some of them do not support
metadata. As a result, a binding on this dynamic var in the
execution thread enables a simple way to remember the parent value
as we visit the children.