mirror of https://github.com/KaiserY/trpl-zh-cn
KaiserY
2 years ago
parent
fef1dba8b0
commit
fbdc47c405
@ -1,13 +1,18 @@
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$ cargo run
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Compiling enums v0.1.0 (file:///projects/enums)
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error[E0004]: non-exhaustive patterns: `None` not covered
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--> src/main.rs:3:15
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3 | match x {
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| ^ pattern `None` not covered
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= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
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= note: the matched value is of type `Option<i32>`
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--> src/main.rs:3:15
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3 | match x {
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| ^ pattern `None` not covered
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note: `Option<i32>` defined here
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= note: the matched value is of type `Option<i32>`
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help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
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4 ~ Some(i) => Some(i + 1),
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5 ~ None => todo!(),
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For more information about this error, try `rustc --explain E0004`.
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error: could not compile `enums` due to previous error
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@ -0,0 +1,19 @@
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$ cargo build
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Compiling restaurant v0.1.0 (file:///projects/restaurant)
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error[E0433]: failed to resolve: use of undeclared crate or module `hosting`
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--> src/lib.rs:11:9
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11 | hosting::add_to_waitlist();
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| ^^^^^^^ use of undeclared crate or module `hosting`
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warning: unused import: `crate::front_of_house::hosting`
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--> src/lib.rs:7:5
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7 | use crate::front_of_house::hosting;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: `#[warn(unused_imports)]` on by default
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For more information about this error, try `rustc --explain E0433`.
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warning: `restaurant` (lib) generated 1 warning
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error: could not compile `restaurant` due to previous error; 1 warning emitted
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@ -1,9 +1,14 @@
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fn main() {
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// ANCHOR: here
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{
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let v = vec![1, 2, 3, 4];
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let v = vec![1, 2, 3, 4, 5];
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// 处理变量 v
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} // <- 这里 v 离开作用域并被丢弃
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// ANCHOR_END: here
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let third: &i32 = &v[2];
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println!("The third element is {third}");
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let third: Option<&i32> = v.get(2);
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match third {
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Some(third) => println!("The third element is {third}"),
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None => println!("There is no third element."),
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}
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// ANCHOR_END: here
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}
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@ -0,0 +1,16 @@
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$ cargo run
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Compiling collections v0.1.0 (file:///projects/collections)
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error[E0502]: cannot borrow `v` as mutable because it is also borrowed as immutable
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--> src/main.rs:6:5
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4 | let first = &v[0];
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| - immutable borrow occurs here
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5 |
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6 | v.push(6);
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| ^^^^^^^^^ mutable borrow occurs here
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7 |
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8 | println!("The first element is: {first}");
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| ----- immutable borrow later used here
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For more information about this error, try `rustc --explain E0502`.
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error: could not compile `collections` due to previous error
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@ -1,8 +1,11 @@
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fn main() {
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// ANCHOR: here
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let v = vec![1, 2, 3, 4, 5];
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let mut v = vec![1, 2, 3, 4, 5];
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let does_not_exist = &v[100];
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let does_not_exist = v.get(100);
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let first = &v[0];
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v.push(6);
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println!("The first element is: {first}");
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// ANCHOR_END: here
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}
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@ -1,11 +1,8 @@
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fn main() {
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// ANCHOR: here
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let mut v = vec![1, 2, 3, 4, 5];
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let first = &v[0];
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v.push(6);
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println!("The first element is: {}", first);
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let v = vec![100, 32, 57];
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for i in &v {
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println!("{i}");
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}
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// ANCHOR_END: here
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}
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@ -1,8 +1,8 @@
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fn main() {
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// ANCHOR: here
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let v = vec![100, 32, 57];
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for i in &v {
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println!("{}", i);
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let mut v = vec![100, 32, 57];
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for i in &mut v {
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*i += 50;
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}
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// ANCHOR_END: here
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}
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@ -1,8 +1,15 @@
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fn main() {
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// ANCHOR: here
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let mut v = vec![100, 32, 57];
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for i in &mut v {
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*i += 50;
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enum SpreadsheetCell {
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Int(i32),
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Float(f64),
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Text(String),
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}
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let row = vec![
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SpreadsheetCell::Int(3),
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SpreadsheetCell::Text(String::from("blue")),
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SpreadsheetCell::Float(10.12),
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];
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// ANCHOR_END: here
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}
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@ -1,15 +1,9 @@
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fn main() {
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// ANCHOR: here
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enum SpreadsheetCell {
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Int(i32),
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Float(f64),
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Text(String),
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}
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{
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let v = vec![1, 2, 3, 4];
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let row = vec![
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SpreadsheetCell::Int(3),
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SpreadsheetCell::Text(String::from("blue")),
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SpreadsheetCell::Float(10.12),
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];
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// ANCHOR_END: here
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// do stuff with v
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} // <- v goes out of scope and is freed here
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// ANCHOR_END: here
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}
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@ -1,5 +1,5 @@
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use std::fs::File;
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fn main() {
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let f = File::open("hello.txt");
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let greeting_file_result = File::open("hello.txt");
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}
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@ -1,5 +1,5 @@
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use std::fs::File;
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fn main() {
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let f = File::open("hello.txt")?;
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let greeting_file = File::open("hello.txt")?;
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}
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@ -1,5 +1,5 @@
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use std::fs::File;
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fn main() {
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let f = File::open("hello.txt").unwrap();
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let greeting_file = File::open("hello.txt").unwrap();
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}
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@ -1,5 +1,6 @@
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use std::fs::File;
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fn main() {
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let f = File::open("hello.txt").expect("Failed to open hello.txt");
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let greeting_file = File::open("hello.txt")
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.expect("hello.txt should be included in this project");
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}
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@ -0,0 +1,22 @@
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use std::fmt::Display;
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struct Pair<T> {
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x: T,
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y: T,
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}
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impl<T> Pair<T> {
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fn new(x: T, y: T) -> Self {
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Self { x, y }
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}
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}
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impl<T: Display + PartialOrd> Pair<T> {
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fn cmp_display(&self) {
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if self.x >= self.y {
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println!("The largest member is x = {}", self.x);
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} else {
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println!("The largest member is y = {}", self.y);
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}
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}
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}
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@ -0,0 +1,15 @@
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$ cargo run
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Compiling chapter10 v0.1.0 (file:///projects/chapter10)
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error[E0597]: `x` does not live long enough
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--> src/main.rs:6:13
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6 | r = &x;
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| ^^ borrowed value does not live long enough
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7 | }
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| - `x` dropped here while still borrowed
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8 |
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9 | println!("r: {}", r);
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| - borrow later used here
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For more information about this error, try `rustc --explain E0597`.
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error: could not compile `chapter10` due to previous error
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@ -0,0 +1,10 @@
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fn main() {
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let r;
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{
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let x = 5;
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r = &x;
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}
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println!("r: {}", r);
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}
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@ -0,0 +1,3 @@
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We have some weird comments pointing out borrowing scopes that we don't want to change;
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unfortunately I haven't found a way to skip them with rustfmt that works so for now we're going to
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manually skip those listings. See: https://github.com/rust-lang/rustfmt/issues/4028
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@ -1,14 +1,10 @@
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fn main() {
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// ANCHOR: here
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{
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let r;
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{
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let x = 5;
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r = &x;
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}
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println!("r: {}", r);
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}
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// ANCHOR_END: here
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}
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let r; // ---------+-- 'a
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// |
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{ // |
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let x = 5; // -+-- 'b |
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r = &x; // | |
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} // -+ |
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// |
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println!("r: {}", r); // |
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} // ---------+
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@ -1,14 +1,8 @@
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fn main() {
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// ANCHOR: here
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{
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let r; // ---------+-- 'a
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// |
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{ // |
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let x = 5; // -+-- 'b |
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r = &x; // | |
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} // -+ |
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// |
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println!("r: {}", r); // |
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} // ---------+
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// ANCHOR_END: here
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}
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let x = 5; // ----------+-- 'b
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// |
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let r = &x; // --+-- 'a |
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// | |
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println!("r: {}", r); // | |
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// --+ |
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} // ----------+
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@ -1,12 +1,7 @@
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fn main() {
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// ANCHOR: here
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{
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let x = 5; // ----------+-- 'b
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// |
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let r = &x; // --+-- 'a |
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// | |
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println!("r: {}", r); // | |
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// --+ |
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} // ----------+
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// ANCHOR_END: here
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let string1 = String::from("abcd");
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let string2 = "xyz";
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let result = longest(string1.as_str(), string2);
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println!("The longest string is {}", result);
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}
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@ -0,0 +1,16 @@
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$ cargo run
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Compiling chapter10 v0.1.0 (file:///projects/chapter10)
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error[E0106]: missing lifetime specifier
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--> src/main.rs:9:33
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9 | fn longest(x: &str, y: &str) -> &str {
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| ---- ---- ^ expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from `x` or `y`
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help: consider introducing a named lifetime parameter
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9 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
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| ++++ ++ ++ ++
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For more information about this error, try `rustc --explain E0106`.
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error: could not compile `chapter10` due to previous error
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Some files were not shown because too many files have changed in this diff Show More
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Reference in new issue