Fix example in orphan rule rationale #1960
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Imberflur
commented
Aug 14, 2025
| An orphan implementation is one that implements a foreign trait for a foreign type. If these were freely allowed, two crates could implement the same trait for the same type in incompatible ways, creating a situation where adding or updating a dependency could break compilation due to conflicting implementations. | ||
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| The orphan rule enables library authors to add new implementations to their traits without fear that they'll break downstream code. Without these restrictions, a library couldn't add an implementation like `impl<T: Display> MyTrait for T` without potentially conflicting with downstream implementations. | ||
| The orphan rule enables library authors to add new implementations to their traits without fear that they'll break downstream code. Without these restrictions, a library couldn't add an implementation like `impl<T: Display> Trait for LocalGenericType<T>` without potentially conflicting with downstream implementations. |
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| The orphan rule enables library authors to add new implementations to their traits without fear that they'll break downstream code. Without these restrictions, a library couldn't add an implementation like `impl<T: Display> Trait for LocalGenericType<T>` without potentially conflicting with downstream implementations. | |
| The orphan rule enables library authors to add new implementations to their traits without fear that they'll break downstream code. With these restrictions, a library can add an implementation like `impl<T: Display> Trait for LocalGenericType<T>` without potentially conflicting with downstream implementations. |
Thinking about removing the double negative here
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The orphan rule doesn't prevent the case of
impl<T: Display> MyTrait for Tfrom breaking downstream. That would involve preventing downstream impls even on local downstream types. What it does prevent is downstream impls on generic types from a library.