[INFO] cloning repository https://github.com/srj31/rust_exp
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/srj31/rust_exp" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsrj31%2Frust_exp", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsrj31%2Frust_exp'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eca97c0570043fe1c64e9c1fc18f356102a7bdc9
[INFO] checking srj31/rust_exp against master#0c1fb2a1e65a57073dc62dd502319a00cf753371 for pr-114655
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsrj31%2Frust_exp" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/srj31/rust_exp on toolchain 0c1fb2a1e65a57073dc62dd502319a00cf753371
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0c1fb2a1e65a57073dc62dd502319a00cf753371" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/srj31/rust_exp
[INFO] finished tweaking git repo https://github.com/srj31/rust_exp
[INFO] tweaked toml for git repo https://github.com/srj31/rust_exp written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/srj31/rust_exp 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" "+0c1fb2a1e65a57073dc62dd502319a00cf753371" "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 srj31/rust_exp against try#1d06cad56a6e74d21cdf272bd6d9479160000fba for pr-114655
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsrj31%2Frust_exp" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/srj31/rust_exp on toolchain 1d06cad56a6e74d21cdf272bd6d9479160000fba
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1d06cad56a6e74d21cdf272bd6d9479160000fba" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/srj31/rust_exp
[INFO] finished tweaking git repo https://github.com/srj31/rust_exp
[INFO] tweaked toml for git repo https://github.com/srj31/rust_exp written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/srj31/rust_exp 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" "+1d06cad56a6e74d21cdf272bd6d9479160000fba" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+1d06cad56a6e74d21cdf272bd6d9479160000fba" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7455c91b0bf8c0028cbde4bb3e01f486bebb9962de50a18bd09ff40ee4eb099
[INFO] running `Command { std: "docker" "start" "-a" "e7455c91b0bf8c0028cbde4bb3e01f486bebb9962de50a18bd09ff40ee4eb099", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7455c91b0bf8c0028cbde4bb3e01f486bebb9962de50a18bd09ff40ee4eb099", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7455c91b0bf8c0028cbde4bb3e01f486bebb9962de50a18bd09ff40ee4eb099", kill_on_drop: false }`
[INFO] [stdout] e7455c91b0bf8c0028cbde4bb3e01f486bebb9962de50a18bd09ff40ee4eb099
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "+1d06cad56a6e74d21cdf272bd6d9479160000fba" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85285c77a4928545c202547d027d5a221579cea1d53b67012c52f8826a222584
[INFO] running `Command { std: "docker" "start" "-a" "85285c77a4928545c202547d027d5a221579cea1d53b67012c52f8826a222584", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_exp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> src/bin/smart_ptrs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let c = Cell::new(1);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/bin/interior_mutability/cell.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Cell<T> {
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 4 |     value: UnsafeCell<T>,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `set` and `get` are never used
[INFO] [stdout]   --> src/bin/interior_mutability/cell.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 7  | / impl<T> Cell<T>
[INFO] [stdout] 8  | | where
[INFO] [stdout] 9  | |     T: Copy,
[INFO] [stdout]    | |____________- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 17 |       pub fn set(&self, value: T) {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |       pub fn get(&self) -> T {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Unshared`, `Shared`, and `Exclusive` are never constructed
[INFO] [stdout]  --> src/bin/interior_mutability/refcell.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum RefState {
[INFO] [stdout]   |      -------- variants in this enum
[INFO] [stdout] 6 |     Unshared,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 7 |     Shared(isize),
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     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: struct `RefCell` is never constructed
[INFO] [stdout]   --> src/bin/interior_mutability/refcell.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct RefCell<T> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `borrow`, and `borrow_mut` are never used
[INFO] [stdout]   --> src/bin/interior_mutability/refcell.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<T> RefCell<T> {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 17 |     pub fn new(value: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn borrow(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub fn borrow_mut(&self) -> Option<&mut T> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> src/bin/smart_ptrs.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let c = Cell::new(1);
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Unshared`, `Shared`, and `Exclusive` are never constructed
[INFO] [stdout]  --> src/bin/interior_mutability/refcell.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum RefState {
[INFO] [stdout]   |      -------- variants in this enum
[INFO] [stdout] 6 |     Unshared,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 7 |     Shared(isize),
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     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]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RefCell` is never constructed
[INFO] [stdout]   --> src/bin/interior_mutability/refcell.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct RefCell<T> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `borrow`, and `borrow_mut` are never used
[INFO] [stdout]   --> src/bin/interior_mutability/refcell.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<T> RefCell<T> {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 17 |     pub fn new(value: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn borrow(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub fn borrow_mut(&self) -> Option<&mut T> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "85285c77a4928545c202547d027d5a221579cea1d53b67012c52f8826a222584", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85285c77a4928545c202547d027d5a221579cea1d53b67012c52f8826a222584", kill_on_drop: false }`
[INFO] [stdout] 85285c77a4928545c202547d027d5a221579cea1d53b67012c52f8826a222584