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Document the historical reference in the newtypes example (#826)

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Document the historical reference in the newtypes example.
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Victor Costan
2023-06-18 05:37:57 -07:00
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@ -39,5 +39,6 @@ fn main() {
* The value passed some validation when it was created, so you no longer have to validate it again at every use: 'PhoneNumber(String)` or `OddNumber(u32)`. * The value passed some validation when it was created, so you no longer have to validate it again at every use: 'PhoneNumber(String)` or `OddNumber(u32)`.
* Demonstrate how to add a `f64` value to a `Newtons` type by accessing the single field in the newtype. * Demonstrate how to add a `f64` value to a `Newtons` type by accessing the single field in the newtype.
* Rust generally doesn’t like inexplicit things, like automatic unwrapping or for instance using booleans as integers. * Rust generally doesn’t like inexplicit things, like automatic unwrapping or for instance using booleans as integers.
* Operator overloading is discussed on Day 3 (generics). * Operator overloading is discussed on Day 3 (generics).
* The example is a subtle reference to the [Mars Climate Orbiter](https://en.wikipedia.org/wiki/Mars_Climate_Orbiter) failure.
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