From c3862107145d245d30aaa7085aa6ade38faff8c1 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Fri, 29 Mar 2019 23:22:11 +0100
Subject: [PATCH] Add missing tryfrom example
---
src/libcore/convert.rs | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/src/libcore/convert.rs b/src/libcore/convert.rs
index 774d648558b48..82902778f3c69 100644
--- a/src/libcore/convert.rs
+++ b/src/libcore/convert.rs
@@ -410,6 +410,26 @@ pub trait TryInto<T>: Sized {
/// When the `!` type is stablized `Infallible` and `!` will be
/// equivalent.
///
+/// `TryFrom<T>` can be implemented as follows:
+///
+/// ```
+/// use std::convert::TryFrom;
+///
+/// struct SuperiorThanZero(i32);
+///
+/// impl TryFrom<i32> for SuperiorThanZero {
+/// type Error = &'static str;
+///
+/// fn try_from(value: i32) -> Result<Self, Self::Error> {
+/// if value < 0 {
+/// Err("SuperiorThanZero only accepts value superior than zero!")
+/// } else {
+/// Ok(SuperiorThanZero(value))
+/// }
+/// }
+/// }
+/// ```
+///
/// # Examples
///
/// As described, [`i32`] implements `TryFrom<i64>`: