[INFO] cloning repository https://github.com/changjiashuai/LinkedList
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/changjiashuai/LinkedList" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchangjiashuai%2FLinkedList", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchangjiashuai%2FLinkedList'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dfea560e7c426552d3b3e0e89d52286d5f868e6d
[INFO] checking changjiashuai/LinkedList against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchangjiashuai%2FLinkedList" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/changjiashuai/LinkedList on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/changjiashuai/LinkedList
[INFO] finished tweaking git repo https://github.com/changjiashuai/LinkedList
[INFO] tweaked toml for git repo https://github.com/changjiashuai/LinkedList written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/changjiashuai/LinkedList 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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 23572f085a981a5ad6888ea975a3433910a95aa3422ea3d01f25a1e767816bd3
[INFO] running `Command { std: "docker" "start" "-a" "23572f085a981a5ad6888ea975a3433910a95aa3422ea3d01f25a1e767816bd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "23572f085a981a5ad6888ea975a3433910a95aa3422ea3d01f25a1e767816bd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23572f085a981a5ad6888ea975a3433910a95aa3422ea3d01f25a1e767816bd3", kill_on_drop: false }`
[INFO] [stdout] 23572f085a981a5ad6888ea975a3433910a95aa3422ea3d01f25a1e767816bd3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a938c87319212d7afcc5e59beb5f37db10dd7fe9ac449661da1fbc908654e1bb
[INFO] running `Command { std: "docker" "start" "-a" "a938c87319212d7afcc5e59beb5f37db10dd7fe9ac449661da1fbc908654e1bb", kill_on_drop: false }`
[INFO] [stderr]     Checking linked_list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/second.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/third.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mem`
[INFO] [stdout]  --> src/fifth.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{mem, ptr};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/second.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/third.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mem`
[INFO] [stdout]  --> src/fifth.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{mem, ptr};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `push` are never used
[INFO] [stdout]   --> src/second.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 77 |     fn push(&mut self, elem: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.13s
[INFO] running `Command { std: "docker" "inspect" "a938c87319212d7afcc5e59beb5f37db10dd7fe9ac449661da1fbc908654e1bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a938c87319212d7afcc5e59beb5f37db10dd7fe9ac449661da1fbc908654e1bb", kill_on_drop: false }`
[INFO] [stdout] a938c87319212d7afcc5e59beb5f37db10dd7fe9ac449661da1fbc908654e1bb
[INFO] checking changjiashuai/LinkedList against try#6289438dbad80b1a0029c66dd3f6abf57c2c51be for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchangjiashuai%2FLinkedList" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/changjiashuai/LinkedList on toolchain 6289438dbad80b1a0029c66dd3f6abf57c2c51be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/changjiashuai/LinkedList
[INFO] finished tweaking git repo https://github.com/changjiashuai/LinkedList
[INFO] tweaked toml for git repo https://github.com/changjiashuai/LinkedList written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/changjiashuai/LinkedList 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" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7fd1512daa28d8d8b7e8faf3d9872a07a2585d2be0f804eaf75247325efc74e8
[INFO] running `Command { std: "docker" "start" "-a" "7fd1512daa28d8d8b7e8faf3d9872a07a2585d2be0f804eaf75247325efc74e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7fd1512daa28d8d8b7e8faf3d9872a07a2585d2be0f804eaf75247325efc74e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fd1512daa28d8d8b7e8faf3d9872a07a2585d2be0f804eaf75247325efc74e8", kill_on_drop: false }`
[INFO] [stdout] 7fd1512daa28d8d8b7e8faf3d9872a07a2585d2be0f804eaf75247325efc74e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f4fc5ec38a8244a7c2ab80ab7c249417b9e78f849087c80cf66d11889dd2e77
[INFO] running `Command { std: "docker" "start" "-a" "1f4fc5ec38a8244a7c2ab80ab7c249417b9e78f849087c80cf66d11889dd2e77", kill_on_drop: false }`
[INFO] [stderr]     Checking linked_list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/second.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/third.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mem`
[INFO] [stdout]  --> src/fifth.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{mem, ptr};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/second.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> src/third.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mem`
[INFO] [stdout]  --> src/fifth.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{mem, ptr};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `push` are never used
[INFO] [stdout]   --> src/second.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | impl<T> List<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 77 |     fn push(&mut self, elem: T) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.10s
[INFO] running `Command { std: "docker" "inspect" "1f4fc5ec38a8244a7c2ab80ab7c249417b9e78f849087c80cf66d11889dd2e77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f4fc5ec38a8244a7c2ab80ab7c249417b9e78f849087c80cf66d11889dd2e77", kill_on_drop: false }`
[INFO] [stdout] 1f4fc5ec38a8244a7c2ab80ab7c249417b9e78f849087c80cf66d11889dd2e77