I tried to define this record, but the Vec2. constructor doesn't exist yet.
How can I use the constructor inside the record's method?
(defrecord Vec2 [x y]
Vector
(mag [this]
(Math/sqrt
(+ (* x x) (* y y))))
(v+ [this] this)
(v+ [this other]
(Vec2. (+ (:x this) (:x other)
(:y this) (:y other))))
(v+ [this a b & c]
(reduce v+
this
(conj c b a))))
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