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Rollup merge of #57312 - Mendess2526:master, r=Centril

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`const fn` is no longer coming soon (const keyword docs)

The `const` keyword [documentation](https://doc.rust-lang.org/std/keyword.const.html) mentions that `const fn`s are coming soon, but they have already been added.
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kennytm 2019-01-05 23:56:56 +08:00 • committed by GitHub
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src/libstd/keyword_docs.rs
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@ -47,8 +47,8 @@ mod as_keyword { }
///
/// Constants must be explicitly typed, unlike with `let` you can't ignore its type and let the
/// compiler figure it out. Any constant value can be defined in a const, which in practice happens
/// to be most things that would be reasonable to have a constant (barring `const fn`s, coming
/// soon). For example, you can't have a File as a `const`.
/// to be most things that would be reasonable to have a constant (barring `const fn`s). For
/// example, you can't have a File as a `const`.
///
/// The only lifetime allowed in a constant is `'static`, which is the lifetime that encompasses
/// all others in a Rust program. For example, if you wanted to define a constant string, it would