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Update const-fn doc in unstable-book

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Update src/doc/unstable-book/src/language-features/const-fn.md

Co-authored-by: Ivan Tham <pickfire@riseup.net>
This commit is contained in:
Daiki Ihara 2020-12-10 01:03:44 +09:00
parent 5019791e2d
commit caab16fa20
1 changed files with 2 additions and 21 deletions
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23
src/doc/unstable-book/src/language-features/const-fn.md
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@ -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)