[INFO] cloning repository https://github.com/huchenxu97/learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/huchenxu97/learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuchenxu97%2Flearn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuchenxu97%2Flearn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 420b0a7c501febfbdc18bfd2a9ee7e037d5ecb4d
[INFO] checking huchenxu97/learn against master#8a65ee08296b36342bf7c3cdc15312ccbc357227 for pr-142704
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuchenxu97%2Flearn" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/huchenxu97/learn on toolchain 8a65ee08296b36342bf7c3cdc15312ccbc357227
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/huchenxu97/learn
[INFO] finished tweaking git repo https://github.com/huchenxu97/learn
[INFO] tweaked toml for git repo https://github.com/huchenxu97/learn written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/huchenxu97/learn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "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-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367
[INFO] running `Command { std: "docker" "start" "-a" "4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367", kill_on_drop: false }`
[INFO] [stdout] 4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3
[INFO] running `Command { std: "docker" "start" "-a" "282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3", kill_on_drop: false }`
[INFO] [stderr]     Checking learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `header` is never read
[INFO] [stdout]  --> src/first.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct  List{
[INFO] [stdout]   |             ---- field in this struct
[INFO] [stdout] 3 |     header: Link,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Empty` and `More` are never constructed
[INFO] [stdout]  --> src/first.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum Link {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 7 |     Empty,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 8 |     More(Box<Node>)
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Link` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `elem` and `next` are never read
[INFO] [stdout]   --> src/first.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Node{
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 12 |     elem: i32,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 13 |     next: Link,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used
[INFO] [stdout]   --> src/first.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl List {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 17 |     fn new()->Self{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     fn push(&mut self, elem: i32){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn pop(&mut self) -> Option<i32>{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, `peek`, `peek_mut`, and `into_iter` are never used
[INFO] [stdout]   --> src/second.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 15 |     fn new()->Self{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     fn push(&mut self, item: T){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn peek(&self)->Option<&T>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn peek_mut(&mut self)->Option<&mut T>{
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn into_iter(self)->IntoIter<T>{
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3", kill_on_drop: false }`
[INFO] [stdout] 282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3
