[INFO] cloning repository https://github.com/scriptonist/interior-mutablility-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/scriptonist/interior-mutablility-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fscriptonist%2Finterior-mutablility-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fscriptonist%2Finterior-mutablility-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0362a6768a03b9bcfdef484514d682427979b4dc
[INFO] checking scriptonist/interior-mutablility-rs against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fscriptonist%2Finterior-mutablility-rs" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/scriptonist/interior-mutablility-rs on toolchain b0696a5160711c068cb1f01b7437db7990d15750
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/scriptonist/interior-mutablility-rs
[INFO] finished tweaking git repo https://github.com/scriptonist/interior-mutablility-rs
[INFO] tweaked toml for git repo https://github.com/scriptonist/interior-mutablility-rs written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/scriptonist/interior-mutablility-rs 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" "+b0696a5160711c068cb1f01b7437db7990d15750" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking scriptonist/interior-mutablility-rs against try#bfe97fcae016881ad333f0ff8cea2cadb9cf136c for pr-121848
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fscriptonist%2Finterior-mutablility-rs" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/scriptonist/interior-mutablility-rs on toolchain bfe97fcae016881ad333f0ff8cea2cadb9cf136c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/scriptonist/interior-mutablility-rs
[INFO] finished tweaking git repo https://github.com/scriptonist/interior-mutablility-rs
[INFO] tweaked toml for git repo https://github.com/scriptonist/interior-mutablility-rs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/scriptonist/interior-mutablility-rs 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" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 14d48229333fa8aa1484eca49a6716ed0aca90a8a60f5d088f9c23e89dd0e7cd
[INFO] running `Command { std: "docker" "start" "-a" "14d48229333fa8aa1484eca49a6716ed0aca90a8a60f5d088f9c23e89dd0e7cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "14d48229333fa8aa1484eca49a6716ed0aca90a8a60f5d088f9c23e89dd0e7cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14d48229333fa8aa1484eca49a6716ed0aca90a8a60f5d088f9c23e89dd0e7cd", kill_on_drop: false }`
[INFO] [stdout] 14d48229333fa8aa1484eca49a6716ed0aca90a8a60f5d088f9c23e89dd0e7cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b29dc88fc20b12db95040270bda302edb986fd1c164fb95a36128beddc71416c
[INFO] running `Command { std: "docker" "start" "-a" "b29dc88fc20b12db95040270bda302edb986fd1c164fb95a36128beddc71416c", kill_on_drop: false }`
[INFO] [stderr]     Checking int-mutability v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Cell` is never constructed
[INFO] [stdout]  --> src/cell.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Cell<T> {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `set`, and `get` are never used
[INFO] [stdout]   --> src/cell.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl<T> Cell<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 8  |     fn new(value: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn set(&self, value: T) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     pub fn get(&self) -> T
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cell` is never constructed
[INFO] [stdout]  --> src/cell.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Cell<T> {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `set`, and `get` are never used
[INFO] [stdout]   --> src/cell.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl<T> Cell<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 8  |     fn new(value: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn set(&self, value: T) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     pub fn get(&self) -> T
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Shared` and `Exclusive` are never constructed
[INFO] [stdout]  --> src/refcell.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum RefState {
[INFO] [stdout]   |      -------- variants in this enum
[INFO] [stdout] 5 |     Unshared,
[INFO] [stdout] 6 |     Shared(usize),
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 7 |     Exclusive,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `RefState` 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`, `borrow`, and `borrow_mut` are never used
[INFO] [stdout]   --> src/refcell.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl<T> RefCell<T> {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 15 |     pub fn new(value: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn borrow(&self) -> Option<Ref<T>> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |     pub fn borrow_mut(&self) -> Option<RefMut<T>> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "b29dc88fc20b12db95040270bda302edb986fd1c164fb95a36128beddc71416c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b29dc88fc20b12db95040270bda302edb986fd1c164fb95a36128beddc71416c", kill_on_drop: false }`
[INFO] [stdout] b29dc88fc20b12db95040270bda302edb986fd1c164fb95a36128beddc71416c
