what's that rule called in rust where you're not allowed to implement a trait for a type unless either the trait or the type is in the current crate
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and why doesn't `impl From<MyType> for String` violate this -- is it because you're specialising From<T> to the concrete From<MyType>
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Because of an oversight in the original rules. There's an accepted and implemented RFC which fixes it. https://github.com/rust-lang/rfcs/pull/2451 …
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Aaand of course Steve already linked it. (never miss an opportunity to plug my RFC though XD)
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