Oh, and of course the final line of the above REPL interaction is this:
user> (meta #'x)
{:ns #<Namespace user>, :name x, :file "NO_SOURCE_FILE", :line 1,
:arglists ([])}
Thus there's a sort of an off-by-one error in that the function
created by defn gets the metadata which was attached to its Var
*before* the defn form was evaluated (which will be the metadata of a
newborn Var if the defn form is the first one to have it constructed),
whereas the Var is subsequently given the correct metadata for the
function. Ouch. :-)
Sincerely,
Michał
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