[INFO] cloning repository https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mesaverde0207/toy-c-compiler-in-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmesaverde0207%2Ftoy-c-compiler-in-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmesaverde0207%2Ftoy-c-compiler-in-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e5cfe794d04bb0e1771d2b770b32a4fbf9d8e06d
[INFO] checking mesaverde0207/toy-c-compiler-in-rust against master#65cd843ae06ad00123c131a431ed5304e4cd577a for pr-122077
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmesaverde0207%2Ftoy-c-compiler-in-rust" "/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/mesaverde0207/toy-c-compiler-in-rust on toolchain 65cd843ae06ad00123c131a431ed5304e4cd577a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+65cd843ae06ad00123c131a431ed5304e4cd577a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] finished tweaking git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] tweaked toml for git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust 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" "+65cd843ae06ad00123c131a431ed5304e4cd577a" "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 mesaverde0207/toy-c-compiler-in-rust against try#e34498b580c936a8f8a419616d9571f03b6c038e for pr-122077
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmesaverde0207%2Ftoy-c-compiler-in-rust" "/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/mesaverde0207/toy-c-compiler-in-rust on toolchain e34498b580c936a8f8a419616d9571f03b6c038e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e34498b580c936a8f8a419616d9571f03b6c038e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] finished tweaking git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust
[INFO] tweaked toml for git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/mesaverde0207/toy-c-compiler-in-rust 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" "+e34498b580c936a8f8a419616d9571f03b6c038e" "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" "+e34498b580c936a8f8a419616d9571f03b6c038e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 78af1ecce630b955f152f3f5cf1d1d19031ae7c0d53271e811f77d3e67270108
[INFO] running `Command { std: "docker" "start" "-a" "78af1ecce630b955f152f3f5cf1d1d19031ae7c0d53271e811f77d3e67270108", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "78af1ecce630b955f152f3f5cf1d1d19031ae7c0d53271e811f77d3e67270108", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78af1ecce630b955f152f3f5cf1d1d19031ae7c0d53271e811f77d3e67270108", kill_on_drop: false }`
[INFO] [stdout] 78af1ecce630b955f152f3f5cf1d1d19031ae7c0d53271e811f77d3e67270108
[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" "+e34498b580c936a8f8a419616d9571f03b6c038e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b79a3d42db0cf41c5f129e13fccbaa3f690bcce845fee3da8a4d2f1121b8966
[INFO] running `Command { std: "docker" "start" "-a" "0b79a3d42db0cf41c5f129e13fccbaa3f690bcce845fee3da8a4d2f1121b8966", kill_on_drop: false }`
[INFO] [stderr]     Checking toy-c-compiler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `tree` is never read
[INFO] [stdout]   --> src/tinyc/parser.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<'a> {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 52 |     lexer: Tokenizer<'a>,
[INFO] [stdout] 53 |     tree: Tree,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[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: field `tree` is never read
[INFO] [stdout]   --> src/tinyc/parser.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<'a> {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 52 |     lexer: Tokenizer<'a>,
[INFO] [stdout] 53 |     tree: Tree,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.13s
[INFO] running `Command { std: "docker" "inspect" "0b79a3d42db0cf41c5f129e13fccbaa3f690bcce845fee3da8a4d2f1121b8966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b79a3d42db0cf41c5f129e13fccbaa3f690bcce845fee3da8a4d2f1121b8966", kill_on_drop: false }`
[INFO] [stdout] 0b79a3d42db0cf41c5f129e13fccbaa3f690bcce845fee3da8a4d2f1121b8966