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Rollup merge of #70812 - rossmacarthur:fix/unit-called-nil, r=LukasKalbertodt

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Do not use "nil" to refer to `()`

"nil" is not used in the [book](https://doc.rust-lang.org/book) or in the [standard library](https://doc.rust-lang.org/std) anywhere else. Because "nil" is often used in programming languages to refer to "None" or "null" I think it could be a little confusing for newcomers to see this type referred to as "nil".
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Dylan DPC 2020-04-05 18:47:48 +02:00 committed by GitHub
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src/libstd/primitive_docs.rs
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@ -320,7 +320,7 @@ mod prim_char {}
#[doc(primitive = "unit")]
//
/// The `()` type, sometimes called "unit" or "nil".
/// The `()` type, also called "unit".
///
/// The `()` type has exactly one value `()`, and is used when there
/// is no other meaningful value that could be returned. `()` is most