[INFO] cloning repository https://github.com/scullionw/too-many-linked-lists
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/scullionw/too-many-linked-lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fscullionw%2Ftoo-many-linked-lists", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fscullionw%2Ftoo-many-linked-lists'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] add2b7e4e6ee6654e22f91e29d92ccce3346d60a
[INFO] testing scullionw/too-many-linked-lists against try#1b74e096b9bfb06f84a3007193dcd2f059cbdf6a for pr-96025
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fscullionw%2Ftoo-many-linked-lists" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/scullionw/too-many-linked-lists on toolchain 1b74e096b9bfb06f84a3007193dcd2f059cbdf6a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1b74e096b9bfb06f84a3007193dcd2f059cbdf6a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/scullionw/too-many-linked-lists
[INFO] finished tweaking git repo https://github.com/scullionw/too-many-linked-lists
[INFO] tweaked toml for git repo https://github.com/scullionw/too-many-linked-lists written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/scullionw/too-many-linked-lists already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1b74e096b9bfb06f84a3007193dcd2f059cbdf6a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1b74e096b9bfb06f84a3007193dcd2f059cbdf6a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 295d73a01f2cd8a7dd8372e9a17102b4710a274fb4cc885002e0c90478e85648
[INFO] running `Command { std: "docker" "start" "-a" "295d73a01f2cd8a7dd8372e9a17102b4710a274fb4cc885002e0c90478e85648", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "295d73a01f2cd8a7dd8372e9a17102b4710a274fb4cc885002e0c90478e85648", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "295d73a01f2cd8a7dd8372e9a17102b4710a274fb4cc885002e0c90478e85648", kill_on_drop: false }`
[INFO] [stdout] 295d73a01f2cd8a7dd8372e9a17102b4710a274fb4cc885002e0c90478e85648
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1b74e096b9bfb06f84a3007193dcd2f059cbdf6a" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a580333478372db6e79819e2354a0b8cbbc3274fc92af11ecec0850f002d3e6
[INFO] running `Command { std: "docker" "start" "-a" "3a580333478372db6e79819e2354a0b8cbbc3274fc92af11ecec0850f002d3e6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling ds-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `next_as_ref_mut`
[INFO] [stdout]   --> src/main.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn next_as_ref_mut(&mut self) -> Option<&mut Node<T>> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/main.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_mut`
[INFO] [stdout]   --> src/main.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 |     fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `Command { std: "docker" "inspect" "3a580333478372db6e79819e2354a0b8cbbc3274fc92af11ecec0850f002d3e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a580333478372db6e79819e2354a0b8cbbc3274fc92af11ecec0850f002d3e6", kill_on_drop: false }`
[INFO] [stdout] 3a580333478372db6e79819e2354a0b8cbbc3274fc92af11ecec0850f002d3e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1b74e096b9bfb06f84a3007193dcd2f059cbdf6a" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 15a5086fdba7cb8b4e0b79937423592d35b3d0ad3cd638136886c8ff1f7924a9
[INFO] running `Command { std: "docker" "start" "-a" "15a5086fdba7cb8b4e0b79937423592d35b3d0ad3cd638136886c8ff1f7924a9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "15a5086fdba7cb8b4e0b79937423592d35b3d0ad3cd638136886c8ff1f7924a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15a5086fdba7cb8b4e0b79937423592d35b3d0ad3cd638136886c8ff1f7924a9", kill_on_drop: false }`
[INFO] [stdout] 15a5086fdba7cb8b4e0b79937423592d35b3d0ad3cd638136886c8ff1f7924a9