[INFO] cloning repository https://github.com/TeoBernier/Prusti_Tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TeoBernier/Prusti_Tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeoBernier%2FPrusti_Tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeoBernier%2FPrusti_Tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e490d7c25c5d76aef855af91138ce7096b62e90d
[INFO] checking TeoBernier/Prusti_Tutorial against master#fb4bca04fa1bde2f7db1b31a59e066f7bebd7fc6 for pr-120361
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeoBernier%2FPrusti_Tutorial" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TeoBernier/Prusti_Tutorial on toolchain fb4bca04fa1bde2f7db1b31a59e066f7bebd7fc6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fb4bca04fa1bde2f7db1b31a59e066f7bebd7fc6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TeoBernier/Prusti_Tutorial
[INFO] finished tweaking git repo https://github.com/TeoBernier/Prusti_Tutorial
[INFO] tweaked toml for git repo https://github.com/TeoBernier/Prusti_Tutorial written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/TeoBernier/Prusti_Tutorial 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" "+fb4bca04fa1bde2f7db1b31a59e066f7bebd7fc6" "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 TeoBernier/Prusti_Tutorial against try#e35e259478581c01033b8da67214c0d376859a32 for pr-120361
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeoBernier%2FPrusti_Tutorial" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TeoBernier/Prusti_Tutorial on toolchain e35e259478581c01033b8da67214c0d376859a32
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e35e259478581c01033b8da67214c0d376859a32" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TeoBernier/Prusti_Tutorial
[INFO] finished tweaking git repo https://github.com/TeoBernier/Prusti_Tutorial
[INFO] tweaked toml for git repo https://github.com/TeoBernier/Prusti_Tutorial written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/TeoBernier/Prusti_Tutorial 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" "+e35e259478581c01033b8da67214c0d376859a32" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking TeoBernier/Prusti_Tutorial against try#e35e259478581c01033b8da67214c0d376859a32 for pr-120361
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTeoBernier%2FPrusti_Tutorial" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TeoBernier/Prusti_Tutorial on toolchain e35e259478581c01033b8da67214c0d376859a32
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e35e259478581c01033b8da67214c0d376859a32" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TeoBernier/Prusti_Tutorial
[INFO] finished tweaking git repo https://github.com/TeoBernier/Prusti_Tutorial
[INFO] tweaked toml for git repo https://github.com/TeoBernier/Prusti_Tutorial written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/TeoBernier/Prusti_Tutorial 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" "+e35e259478581c01033b8da67214c0d376859a32" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded prusti-contracts-proc-macros v0.1.9
[INFO] [stderr]   Downloaded prusti-contracts v0.1.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+e35e259478581c01033b8da67214c0d376859a32" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 634c1e7ffa21d6b3aabe22ba14cc65d881047b01aac0098fb8993dc8fa9576eb
[INFO] running `Command { std: "docker" "start" "-a" "634c1e7ffa21d6b3aabe22ba14cc65d881047b01aac0098fb8993dc8fa9576eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "634c1e7ffa21d6b3aabe22ba14cc65d881047b01aac0098fb8993dc8fa9576eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "634c1e7ffa21d6b3aabe22ba14cc65d881047b01aac0098fb8993dc8fa9576eb", kill_on_drop: false }`
[INFO] [stdout] 634c1e7ffa21d6b3aabe22ba14cc65d881047b01aac0098fb8993dc8fa9576eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+e35e259478581c01033b8da67214c0d376859a32" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f157d0db66c5022ad8ef818171d74c19a200165cfd4ca145670473df05abf950
[INFO] running `Command { std: "docker" "start" "-a" "f157d0db66c5022ad8ef818171d74c19a200165cfd4ca145670473df05abf950", kill_on_drop: false }`
[INFO] [stderr]    Compiling prusti-contracts-proc-macros v0.1.9
[INFO] [stderr]     Checking prusti-contracts v0.1.9
[INFO] [stderr]     Checking prusti_tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `is_empty` is never used
[INFO] [stdout]   --> src/main.rs:84:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | impl Link {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 84 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_empty` is never used
[INFO] [stdout]   --> src/main.rs:84:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | impl Link {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 84 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "f157d0db66c5022ad8ef818171d74c19a200165cfd4ca145670473df05abf950", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f157d0db66c5022ad8ef818171d74c19a200165cfd4ca145670473df05abf950", kill_on_drop: false }`
[INFO] [stdout] f157d0db66c5022ad8ef818171d74c19a200165cfd4ca145670473df05abf950