> The metadata tells you why:
>
> user=> (meta #'*dynamo*)
> {:ns #<Namespace user>, :name *dynamo*, :dynamic true, :line 1, :file ...}
The var tells you why:
user=> (.isDynamic (var *dynamo*))
true
>
> Now let's make another variable with `intern`, copying the metadata from
> `*dynamo*`:
> user=> (intern *ns* (with-meta '*copy* (meta #'*dynamo*)) *dynamo*)
> Same metadata (except for the name):
> user=> (meta #'*copy*)
> {:ns #<Namespace user>, :name *copy*, :dynamic true, :line 1, :file ...}
> But you can't rebind:
> user=> (binding [*copy* "new value"] *copy*)
> IllegalStateException Can't dynamically bind non-dynamic var: user/*copy*
> clojure.lang.Var.pushThreadBindings (Var.java:339)
user=> (.isDynamic (var *copy*))
false
user=> (.setDynamic (var *copy*))
#'user/*copy*
user=> (binding [*copy* "new value"] *copy*)
"new value"
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