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feat: add Hashable instance for Char (#5747)

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I needed this in downstream code, and it seems to make the most sense to
just contribute it here.
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David Thrane Christiansen 2024-10-17 16:46:10 +02:00 • committed by GitHub
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commit d6a7eb3987
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src/Init/Data/Hashable.lean
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@ -51,6 +51,9 @@ instance : Hashable USize where
instance : Hashable (Fin n) where
hash v := v.val.toUInt64
instance : Hashable Char where
hash c := c.val.toUInt64
instance : Hashable Int where
hash
| Int.ofNat n => UInt64.ofNat (2 * n)