An implicit equality typeclass instance, 2015: implicit val intEqual: Eq[Int] = new Eq[Int] { def equal(x: Int, y: Int): Boolean = x == y } (1/8)
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SAM types introduced, 2016: implicit val intEqual: Eq[Int] = (x: Int, y: Int) => x == y (2/8)
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Type inference improves, 2017: implicit val intEq: Eq[Int] = (x, y) => x == y (3/8)
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Developers get lazier, 2018: implicit val intEq: Eq[Int] = _ == _ (4/8)
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Some forgotten experiments, 2019: witness intEq: Eq[Int] = _ == _ (5/8)
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We settle on `given`, 2020: given intEq: Eq[Int] = _ == _ (6/8)
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