[INFO] updating cached repository https://github.com/lazylook2/rust_study
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 499240ac56e70a5f7559cd7ce6c956e5db066df0
[INFO] testing lazylook2/rust_study against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flazylook2%2Frust_study" "/workspace/builds/worker-10/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lazylook2/rust_study on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/lazylook2/rust_study
[INFO] finished tweaking git repo https://github.com/lazylook2/rust_study
[INFO] tweaked toml for git repo https://github.com/lazylook2/rust_study written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/lazylook2/rust_study already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] eee1822b6e03652c56c9008f133ce1ae62332341dfa156daacfaff7ab600f684
[INFO] running `"docker" "start" "-a" "eee1822b6e03652c56c9008f133ce1ae62332341dfa156daacfaff7ab600f684"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/common.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y = {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `number`
[INFO] [stderr]   --> src/common.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let number = if condition {
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user1`
[INFO] [stderr]  --> src/structs.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let user1 = User{
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let user2 = User{
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]  --> src/enum_match.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let four = IpAddKind::V4;
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enum_match.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip_type`
[INFO] [stderr]  --> src/enum_match.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stderr]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/collections.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first`
[INFO] [stderr]   --> src/collections.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let first = &v[0];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/collections.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let s = data.to_string(); // String
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let s = "initial contents".to_string();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let s = String::from("initial contents");
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/collections.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     let hello = &s[0..5];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/collections.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/collections.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let slice = &a[1..3];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]   --> src/collections.rs:96:9
[INFO] [stderr]    |
[INFO] [stderr] 96 |     let word = first_word(&s); // word 的值为 5
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scores`
[INFO] [stderr]    --> src/collections.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/error.rs:48:13
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let mut f = File::open("fuck.txt");
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/structs.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         active: bool,
[INFO] [stderr]   |         ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn build_user(username: String) -> User{
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enum_match.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stderr]   |                        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]  --> src/enum_match.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |         kind: IpAddKind,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]  --> src/enum_match.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |         address: String,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/enum_match.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         Quit,   // 没有关联任何数据
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/enum_match.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/enum_match.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file1`
[INFO] [stderr]   --> src/error.rs:69:8
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `String1` should have a snake case name
[INFO] [stderr]   --> src/collections.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 | pub fn String1() {
[INFO] [stderr]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 34 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.80s
[INFO] running `"docker" "inspect" "eee1822b6e03652c56c9008f133ce1ae62332341dfa156daacfaff7ab600f684"`
[INFO] running `"docker" "rm" "-f" "eee1822b6e03652c56c9008f133ce1ae62332341dfa156daacfaff7ab600f684"`
[INFO] [stdout] eee1822b6e03652c56c9008f133ce1ae62332341dfa156daacfaff7ab600f684
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e76b1aa710c97545eba3f9557ca555d9a85e2087453246ee4592b164d3ce2413
[INFO] running `"docker" "start" "-a" "e76b1aa710c97545eba3f9557ca555d9a85e2087453246ee4592b164d3ce2413"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/common.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y = {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `number`
[INFO] [stderr]   --> src/common.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let number = if condition {
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user1`
[INFO] [stderr]  --> src/structs.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let user1 = User{
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let user2 = User{
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]  --> src/enum_match.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let four = IpAddKind::V4;
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enum_match.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip_type`
[INFO] [stderr]  --> src/enum_match.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stderr]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/collections.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first`
[INFO] [stderr]   --> src/collections.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let first = &v[0];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/collections.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let s = data.to_string(); // String
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let s = "initial contents".to_string();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let s = String::from("initial contents");
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/collections.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     let hello = &s[0..5];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/collections.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/collections.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let slice = &a[1..3];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]   --> src/collections.rs:96:9
[INFO] [stderr]    |
[INFO] [stderr] 96 |     let word = first_word(&s); // word 的值为 5
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scores`
[INFO] [stderr]    --> src/collections.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/error.rs:48:13
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let mut f = File::open("fuck.txt");
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/structs.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         active: bool,
[INFO] [stderr]   |         ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn build_user(username: String) -> User{
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enum_match.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stderr]   |                        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]  --> src/enum_match.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |         kind: IpAddKind,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]  --> src/enum_match.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |         address: String,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/enum_match.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         Quit,   // 没有关联任何数据
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/enum_match.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/enum_match.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file1`
[INFO] [stderr]   --> src/error.rs:69:8
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `String1` should have a snake case name
[INFO] [stderr]   --> src/collections.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 | pub fn String1() {
[INFO] [stderr]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 34 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/common.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y = {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `number`
[INFO] [stderr]   --> src/common.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let number = if condition {
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user1`
[INFO] [stderr]  --> src/structs.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let user1 = User{
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let user2 = User{
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]  --> src/enum_match.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let four = IpAddKind::V4;
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enum_match.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip_type`
[INFO] [stderr]  --> src/enum_match.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stderr]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/collections.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first`
[INFO] [stderr]   --> src/collections.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let first = &v[0];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/collections.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let s = data.to_string(); // String
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let s = "initial contents".to_string();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let s = String::from("initial contents");
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/collections.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     let hello = &s[0..5];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/collections.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/collections.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let slice = &a[1..3];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]   --> src/collections.rs:96:9
[INFO] [stderr]    |
[INFO] [stderr] 96 |     let word = first_word(&s); // word 的值为 5
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scores`
[INFO] [stderr]    --> src/collections.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/error.rs:48:13
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let mut f = File::open("fuck.txt");
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/structs.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         active: bool,
[INFO] [stderr]   |         ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn build_user(username: String) -> User{
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enum_match.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stderr]   |                        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]  --> src/enum_match.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |         kind: IpAddKind,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]  --> src/enum_match.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |         address: String,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/enum_match.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         Quit,   // 没有关联任何数据
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/enum_match.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/enum_match.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file1`
[INFO] [stderr]   --> src/error.rs:69:8
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `String1` should have a snake case name
[INFO] [stderr]   --> src/collections.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 | pub fn String1() {
[INFO] [stderr]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 34 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.37s
[INFO] running `"docker" "inspect" "e76b1aa710c97545eba3f9557ca555d9a85e2087453246ee4592b164d3ce2413"`
[INFO] running `"docker" "rm" "-f" "e76b1aa710c97545eba3f9557ca555d9a85e2087453246ee4592b164d3ce2413"`
[INFO] [stdout] e76b1aa710c97545eba3f9557ca555d9a85e2087453246ee4592b164d3ce2413
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 02168cece62cc6aaf6380aec7a6accc561453525da4d2442644de0b702c0408c
[INFO] running `"docker" "start" "-a" "02168cece62cc6aaf6380aec7a6accc561453525da4d2442644de0b702c0408c"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/common.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y = {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `number`
[INFO] [stderr]   --> src/common.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let number = if condition {
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user1`
[INFO] [stderr]  --> src/structs.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let user1 = User{
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let user2 = User{
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]  --> src/enum_match.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let four = IpAddKind::V4;
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enum_match.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip_type`
[INFO] [stderr]  --> src/enum_match.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stderr]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/collections.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first`
[INFO] [stderr]   --> src/collections.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let first = &v[0];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/collections.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let s = data.to_string(); // String
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let s = "initial contents".to_string();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let s = String::from("initial contents");
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/collections.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     let hello = &s[0..5];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/collections.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/collections.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let slice = &a[1..3];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]   --> src/collections.rs:96:9
[INFO] [stderr]    |
[INFO] [stderr] 96 |     let word = first_word(&s); // word 的值为 5
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scores`
[INFO] [stderr]    --> src/collections.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/error.rs:48:13
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let mut f = File::open("fuck.txt");
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/structs.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         active: bool,
[INFO] [stderr]   |         ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn build_user(username: String) -> User{
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enum_match.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stderr]   |                        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]  --> src/enum_match.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |         kind: IpAddKind,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]  --> src/enum_match.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |         address: String,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/enum_match.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         Quit,   // 没有关联任何数据
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/enum_match.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/enum_match.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file1`
[INFO] [stderr]   --> src/error.rs:69:8
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `String1` should have a snake case name
[INFO] [stderr]   --> src/collections.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 | pub fn String1() {
[INFO] [stderr]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 34 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ErrorKind`, `Error`
[INFO] [stderr]  --> src/error.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{ErrorKind, Read, Error};
[INFO] [stderr]   |               ^^^^^^^^^        ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/common.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let y = {
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `number`
[INFO] [stderr]   --> src/common.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let number = if condition {
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user1`
[INFO] [stderr]  --> src/structs.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let user1 = User{
[INFO] [stderr]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let user2 = User{
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]  --> src/enum_match.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let four = IpAddKind::V4;
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enum_match.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let home = IpAddr{ kind: IpAddKind::V4, address: String::from("127.0.0.1") };
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip_type`
[INFO] [stderr]  --> src/enum_match.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 |     fn route (ip_type: IpAddKind) { }
[INFO] [stderr]   |               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_type`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/collections.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first`
[INFO] [stderr]   --> src/collections.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let first = &v[0];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/collections.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let s = data.to_string(); // String
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let s = "initial contents".to_string();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let s = String::from("initial contents");
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/collections.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |     let s = s1 + "-" + &s2; // String 和 &str。s1 被移动了，不能继续使用
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/collections.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |     let hello = &s[0..5];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/collections.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/collections.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let slice = &a[1..3];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]   --> src/collections.rs:96:9
[INFO] [stderr]    |
[INFO] [stderr] 96 |     let word = first_word(&s); // word 的值为 5
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scores`
[INFO] [stderr]    --> src/collections.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scores`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collections.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut s = String::new(); // String 这样拥有所有权，被移动就回不来了
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/error.rs:48:13
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let mut f = File::open("fuck.txt");
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/structs.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         active: bool,
[INFO] [stderr]   |         ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn build_user(username: String) -> User{
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enum_match.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 |     enum IpAddKind {V4,V6,}
[INFO] [stderr]   |                        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]  --> src/enum_match.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |         kind: IpAddKind,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]  --> src/enum_match.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |         address: String,
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/enum_match.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         Quit,   // 没有关联任何数据
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/enum_match.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         Move {x: i32, y: i32},  // 包含一个匿名结构体
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/enum_match.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         ChangeColor(i32, i32, i32), // 包含三个 i32
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file1`
[INFO] [stderr]   --> src/error.rs:69:8
[INFO] [stderr]    |
[INFO] [stderr] 69 |     fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `String1` should have a snake case name
[INFO] [stderr]   --> src/collections.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 | pub fn String1() {
[INFO] [stderr]    |        ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `string1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 34 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_study-3277a6ba26db7cb3
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_study-087190b2761135ab
[INFO] [stdout] running 0 tests
[INFO] [stderr]    Doc-tests rust_study
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "02168cece62cc6aaf6380aec7a6accc561453525da4d2442644de0b702c0408c"`
[INFO] running `"docker" "rm" "-f" "02168cece62cc6aaf6380aec7a6accc561453525da4d2442644de0b702c0408c"`
[INFO] [stdout] 02168cece62cc6aaf6380aec7a6accc561453525da4d2442644de0b702c0408c