Rust unstable book: basic desc and example for `const_fn`.
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cargo
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Subproject commit 4a3c0a63b07e9a4feb41cb11de37c92a09db5a60
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Subproject commit 5f3b9c4c6a7be1f177d6024cb83d150b6479148a
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@ -6,5 +6,24 @@ The tracking issue for this feature is: [#24111]
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------------------------
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------------------------
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The `const_fn` feature allows marking free functions and inherent methods as
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`const`, enabling them to be called in constants contexts, with constant
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arguments.
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## Examples
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```rust
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#![feature(const_fn)]
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const fn double(x: i32) -> i32 {
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x * 2
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}
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const FIVE: i32 = 5;
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const TEN: i32 = double(FIVE);
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fn main() {
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assert_eq!(5, FIVE);
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assert_eq!(10, TEN);
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}
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```
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