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format code: format code in type-conversions/from-into

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chenhai
2023-08-06 22:30:24 +08:00
parent 88191e18b2
commit 9f2605bf6b
3 changed files with 14 additions and 20 deletions
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11
en/src/type-conversions/from-into.md
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@ -27,16 +27,15 @@ Some implementations of `From` trait can be found [here](https://doc.rust-lang.o
1. 🌟🌟🌟
```rust,editable
fn main() {
// impl From<bool> for i32
let i1:i32 = false.into();
let i2:i32 = i32::from(false);
// impl From<bool> for i32
let i1: i32 = false.into();
let i2: i32 = i32::from(false);
assert_eq!(i1, i2);
assert_eq!(i1, 0);
// FIX the error in two ways
/* 1. use a similar type which `impl From<char>`, maybe you
/* 1. use a similar type which `impl From<char>`, maybe you
should check the docs mentioned above to find the answer */
// 2. a keyword from the last chapter
let i3: i32 = 'a'.into();
@ -51,7 +50,6 @@ fn main() {
### Implement `From` for custom types
2. 🌟🌟
```rust,editable
// From is now included in `std::prelude`, so there is no need to introduce it into the current scope
// use std::convert::From;
@ -78,7 +76,6 @@ fn main() {
3. 🌟🌟🌟 When performing error handling it is often useful to implement `From` trait for our own error type. Then we can use `?` to automatically convert the underlying error type to our own error type.
```rust,editable
use std::fs;
use std::io;
use std::num;