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Update const-fn doc in unstable-book #79858

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Dec 11, 2020
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Update const-fn doc in unstable-book #79858

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23 changes: 2 additions & 21 deletions src/doc/unstable-book/src/language-features/const-fn.md
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Expand Up @@ -6,24 +6,5 @@ The tracking issue for this feature is: [#57563]

------------------------

The `const_fn` feature allows marking free functions and inherent methods as
`const`, enabling them to be called in constants contexts, with constant
arguments.

## Examples

```rust
#![feature(const_fn)]

const fn double(x: i32) -> i32 {
x * 2
}

const FIVE: i32 = 5;
const TEN: i32 = double(FIVE);

fn main() {
assert_eq!(5, FIVE);
assert_eq!(10, TEN);
}
```
The `const_fn` feature enables additional functionality not stabilized in the
[minimal subset of `const_fn`](https://github.com/rust-lang/rust/issues/53555)