[INFO] cloning repository https://github.com/uix-op/MyDataStruct
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/uix-op/MyDataStruct" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fuix-op%2FMyDataStruct", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fuix-op%2FMyDataStruct'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 39a2c0ec17e997c7ada9d23d02bd6871e3bdbaa8
[INFO] checking uix-op/MyDataStruct against master#5337252b9952fdd9482ed6a4add17254e5bd2c40 for pr-138785
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fuix-op%2FMyDataStruct" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/uix-op/MyDataStruct on toolchain 5337252b9952fdd9482ed6a4add17254e5bd2c40
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5337252b9952fdd9482ed6a4add17254e5bd2c40" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/uix-op/MyDataStruct
[INFO] finished tweaking git repo https://github.com/uix-op/MyDataStruct
[INFO] tweaked toml for git repo https://github.com/uix-op/MyDataStruct written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/uix-op/MyDataStruct 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" "+5337252b9952fdd9482ed6a4add17254e5bd2c40" "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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+5337252b9952fdd9482ed6a4add17254e5bd2c40" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 42ee3f6f8751625e853534be4d4e41c331f52f5cc489884d0f566db548848881
[INFO] running `Command { std: "docker" "start" "-a" "42ee3f6f8751625e853534be4d4e41c331f52f5cc489884d0f566db548848881", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "42ee3f6f8751625e853534be4d4e41c331f52f5cc489884d0f566db548848881", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42ee3f6f8751625e853534be4d4e41c331f52f5cc489884d0f566db548848881", kill_on_drop: false }`
[INFO] [stdout] 42ee3f6f8751625e853534be4d4e41c331f52f5cc489884d0f566db548848881
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+5337252b9952fdd9482ed6a4add17254e5bd2c40" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2a7e3888206ee6db880849ba390519c5e18886409abcf70ea7f55f0d779727cf
[INFO] running `Command { std: "docker" "start" "-a" "2a7e3888206ee6db880849ba390519c5e18886409abcf70ea7f55f0d779727cf", kill_on_drop: false }`
[INFO] [stderr]     Checking MyDataStruct v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `Next` is never constructed
[INFO] [stdout]   --> src/data_struct.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub enum NextPtr {
[INFO] [stdout]    |              ------- variant in this enum
[INFO] [stdout] 17 |         Null,
[INFO] [stdout] 18 |         Next(Box<Node>),
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `insert_to_first`, `delete_from_first`, and `insert_to_last` are never used
[INFO] [stdout]   --> src/data_struct.rs:25:16
[INFO] [stdout]    |
[INFO] [stdout] 24 |     impl List {
[INFO] [stdout]    |     --------- associated items in this implementation
[INFO] [stdout] 25 |         pub fn new() -> Self{
[INFO] [stdout]    |                ^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |         pub fn insert_to_first(&mut self,data:i32) -> (){
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |         pub fn delete_from_first(&mut self) -> (){
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 44 |         pub fn insert_to_last(&mut self,data:i32) -> (){
[INFO] [stdout]    |                ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "2a7e3888206ee6db880849ba390519c5e18886409abcf70ea7f55f0d779727cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a7e3888206ee6db880849ba390519c5e18886409abcf70ea7f55f0d779727cf", kill_on_drop: false }`
[INFO] [stdout] 2a7e3888206ee6db880849ba390519c5e18886409abcf70ea7f55f0d779727cf