There's an example on metadata that resembles a repl session snippet
(although not exactly):

user=> (def x 1)
user=> (def y 2)
user=> ^{:x x} [x y 3]
^{:x 1} [1 2 3]

I interpret that as "the reader prints out meta data", which of course
is not true (by default). It could be changed, e.g. to

user=> (def x 1)
user=> (def y 2)
user> (meta ^{:x x} [x y 3])
{:x 1}

or to

user=> (def x 1)
user=> (def y 2)
user> (set! *print-meta* true)
true
user=> ^{:x x} [x y 3]
^{:x 1} [1 2 3]

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