[INFO] cloning repository https://github.com/jangozw/rust-study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jangozw/rust-study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjangozw%2Frust-study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjangozw%2Frust-study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d4ff38159d2a37d49a1e7fa8d71f4099fd84337
[INFO] testing jangozw/rust-study against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjangozw%2Frust-study" "/workspace/builds/worker-117/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-117/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jangozw/rust-study on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jangozw/rust-study
[INFO] finished tweaking git repo https://github.com/jangozw/rust-study
[INFO] tweaked toml for git repo https://github.com/jangozw/rust-study written to /workspace/builds/worker-117/source/Cargo.toml
[INFO] crate git repo https://github.com/jangozw/rust-study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4fc8081bc6b8d7bcd99c3be2368683d23d1de3d6bceead453a8558d37b0c04ba
[INFO] running `Command { std: "docker" "start" "-a" "4fc8081bc6b8d7bcd99c3be2368683d23d1de3d6bceead453a8558d37b0c04ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4fc8081bc6b8d7bcd99c3be2368683d23d1de3d6bceead453a8558d37b0c04ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4fc8081bc6b8d7bcd99c3be2368683d23d1de3d6bceead453a8558d37b0c04ba", kill_on_drop: false }`
[INFO] [stdout] 4fc8081bc6b8d7bcd99c3be2368683d23d1de3d6bceead453a8558d37b0c04ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89751293f5003127f006fb330215d0ccd8c2ac34a1f7bceee886afcccb1e06d7
[INFO] running `Command { std: "docker" "start" "-a" "89751293f5003127f006fb330215d0ccd8c2ac34a1f7bceee886afcccb1e06d7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling datastruct v0.1.0 (/opt/rustwide/workdir/datastruct)
[INFO] [stdout] warning: unused imports: `Display`, `Error`
[INFO] [stdout]  --> datastruct/src/single_link.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display, Error};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `link_node` should have an upper camel case name
[INFO] [stdout]   --> datastruct/src/single_link.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct link_node<T> {
[INFO] [stdout]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `LinkNode`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `link_list` should have an upper camel case name
[INFO] [stdout]   --> datastruct/src/single_link.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct link_list<T>{
[INFO] [stdout]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `LinkList`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> datastruct/src/single_link.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |         for i in 0..pos{
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> datastruct/src/single_link.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let mut insert = Box::new(link_node::new(data));
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `data`
[INFO] [stdout]   --> datastruct/src/single_link.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     data: T,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `link_node` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> datastruct/src/single_link.rs:9:10
[INFO] [stdout]    |
[INFO] [stdout] 9  | #[derive(Debug, Clone)]
[INFO] [stdout]    |          ^^^^^  ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]   --> datastruct/src/single_link.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     next: Option<Box<link_node<T>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `link_node` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> datastruct/src/single_link.rs:9:10
[INFO] [stdout]    |
[INFO] [stdout] 9  | #[derive(Debug, Clone)]
[INFO] [stdout]    |          ^^^^^  ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]   --> datastruct/src/single_link.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     head: Option<Box<link_node<T>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `link_list` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> datastruct/src/single_link.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> datastruct/src/single_link.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn new(data: T)->Self{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> datastruct/src/single_link.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn new()->Self{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head_insert`
[INFO] [stdout]   --> datastruct/src/single_link.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn head_insert(&mut self, data: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `rear_insert`
[INFO] [stdout]   --> datastruct/src/single_link.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 |     fn rear_insert(&mut self, data: T){
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `position_insert`
[INFO] [stdout]   --> datastruct/src/single_link.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 |     fn position_insert(&mut self, data: T, pos: i32) ->Result<i32, String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rust-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.84s
[INFO] running `Command { std: "docker" "inspect" "89751293f5003127f006fb330215d0ccd8c2ac34a1f7bceee886afcccb1e06d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89751293f5003127f006fb330215d0ccd8c2ac34a1f7bceee886afcccb1e06d7", kill_on_drop: false }`
[INFO] [stdout] 89751293f5003127f006fb330215d0ccd8c2ac34a1f7bceee886afcccb1e06d7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca8711c8489a7998e935e89c1c87c73ee569dd847f8077d8175185bd620cc1b9
[INFO] running `Command { std: "docker" "start" "-a" "ca8711c8489a7998e935e89c1c87c73ee569dd847f8077d8175185bd620cc1b9", kill_on_drop: false }`
[INFO] [stdout] warning: unused imports: `Display`, `Error`
[INFO] [stdout]  --> datastruct/src/single_link.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display, Error};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `link_node` should have an upper camel case name
[INFO] [stdout]   --> datastruct/src/single_link.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct link_node<T> {
[INFO] [stdout]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `LinkNode`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `link_list` should have an upper camel case name
[INFO] [stdout]   --> datastruct/src/single_link.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct link_list<T>{
[INFO] [stdout]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `LinkList`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> datastruct/src/single_link.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |         for i in 0..pos{
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> datastruct/src/single_link.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let mut insert = Box::new(link_node::new(data));
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `data`
[INFO] [stdout]   --> datastruct/src/single_link.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     data: T,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `link_node` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> datastruct/src/single_link.rs:9:10
[INFO] [stdout]    |
[INFO] [stdout] 9  | #[derive(Debug, Clone)]
[INFO] [stdout]    |          ^^^^^  ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]   --> datastruct/src/single_link.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     next: Option<Box<link_node<T>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `link_node` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> datastruct/src/single_link.rs:9:10
[INFO] [stdout]    |
[INFO] [stdout] 9  | #[derive(Debug, Clone)]
[INFO] [stdout]    |          ^^^^^  ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]   --> datastruct/src/single_link.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     head: Option<Box<link_node<T>>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `link_list` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> datastruct/src/single_link.rs:16:10
[INFO] [stdout]    |
[INFO] [stdout] 16 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> datastruct/src/single_link.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn new(data: T)->Self{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> datastruct/src/single_link.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn new()->Self{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head_insert`
[INFO] [stdout]   --> datastruct/src/single_link.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn head_insert(&mut self, data: T) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `rear_insert`
[INFO] [stdout]   --> datastruct/src/single_link.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 |     fn rear_insert(&mut self, data: T){
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `position_insert`
[INFO] [stdout]   --> datastruct/src/single_link.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 |     fn position_insert(&mut self, data: T, pos: i32) ->Result<i32, String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rust-study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.52s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_study-e0ed4dc8b5081f02)
[INFO] running `Command { std: "docker" "inspect" "ca8711c8489a7998e935e89c1c87c73ee569dd847f8077d8175185bd620cc1b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca8711c8489a7998e935e89c1c87c73ee569dd847f8077d8175185bd620cc1b9", kill_on_drop: false }`
[INFO] [stdout] ca8711c8489a7998e935e89c1c87c73ee569dd847f8077d8175185bd620cc1b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-117/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 026bb205ed9fa01037363b6a19fdbb48651a7ff3963a7334ca0a05827fd4316a
[INFO] running `Command { std: "docker" "start" "-a" "026bb205ed9fa01037363b6a19fdbb48651a7ff3963a7334ca0a05827fd4316a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused imports: `Display`, `Error`
[INFO] [stderr]  --> datastruct/src/single_link.rs:1:23
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fmt::{Debug, Display, Error};
[INFO] [stderr]   |                       ^^^^^^^  ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `link_node` should have an upper camel case name
[INFO] [stderr]   --> datastruct/src/single_link.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | struct link_node<T> {
[INFO] [stderr]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `LinkNode`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `link_list` should have an upper camel case name
[INFO] [stderr]   --> datastruct/src/single_link.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | struct link_list<T>{
[INFO] [stderr]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `LinkList`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> datastruct/src/single_link.rs:83:13
[INFO] [stderr]    |
[INFO] [stderr] 83 |         for i in 0..pos{
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> datastruct/src/single_link.rs:76:13
[INFO] [stderr]    |
[INFO] [stderr] 76 |         let mut insert = Box::new(link_node::new(data));
[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: field is never read: `data`
[INFO] [stderr]   --> datastruct/src/single_link.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     data: T,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] note: `link_node` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> datastruct/src/single_link.rs:9:10
[INFO] [stderr]    |
[INFO] [stderr] 9  | #[derive(Debug, Clone)]
[INFO] [stderr]    |          ^^^^^  ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `next`
[INFO] [stderr]   --> datastruct/src/single_link.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     next: Option<Box<link_node<T>>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `link_node` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> datastruct/src/single_link.rs:9:10
[INFO] [stderr]    |
[INFO] [stderr] 9  | #[derive(Debug, Clone)]
[INFO] [stderr]    |          ^^^^^  ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `head`
[INFO] [stderr]   --> datastruct/src/single_link.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     head: Option<Box<link_node<T>>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `link_list` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> datastruct/src/single_link.rs:16:10
[INFO] [stderr]    |
[INFO] [stderr] 16 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> datastruct/src/single_link.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn new(data: T)->Self{
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> datastruct/src/single_link.rs:31:8
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn new()->Self{
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `head_insert`
[INFO] [stderr]   --> datastruct/src/single_link.rs:37:8
[INFO] [stderr]    |
[INFO] [stderr] 37 |     fn head_insert(&mut self, data: T) {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `rear_insert`
[INFO] [stderr]   --> datastruct/src/single_link.rs:50:8
[INFO] [stderr]    |
[INFO] [stderr] 50 |     fn rear_insert(&mut self, data: T){
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `position_insert`
[INFO] [stderr]   --> datastruct/src/single_link.rs:74:8
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn position_insert(&mut self, data: T, pos: i32) ->Result<i32, String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `datastruct` (lib) generated 13 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.93s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_study-e0ed4dc8b5081f02)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "026bb205ed9fa01037363b6a19fdbb48651a7ff3963a7334ca0a05827fd4316a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "026bb205ed9fa01037363b6a19fdbb48651a7ff3963a7334ca0a05827fd4316a", kill_on_drop: false }`
[INFO] [stdout] 026bb205ed9fa01037363b6a19fdbb48651a7ff3963a7334ca0a05827fd4316a