[INFO] cloning repository https://github.com/jbc2313/learning_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jbc2313/learning_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbc2313%2Flearning_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbc2313%2Flearning_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0709b0619d70d07df1e576ebb8166fb3e5a33753
[INFO] checking jbc2313/learning_rust against try#c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6 for pr-145463
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbc2313%2Flearning_rust" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jbc2313/learning_rust
[INFO] finished tweaking git repo https://github.com/jbc2313/learning_rust
[INFO] tweaked toml for git repo https://github.com/jbc2313/learning_rust written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jbc2313/learning_rust on toolchain c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jbc2313/learning_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" "+c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking jbc2313/learning_rust against try#c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6 for pr-145463
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbc2313%2Flearning_rust" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jbc2313/learning_rust
[INFO] finished tweaking git repo https://github.com/jbc2313/learning_rust
[INFO] tweaked toml for git repo https://github.com/jbc2313/learning_rust written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jbc2313/learning_rust on toolchain c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jbc2313/learning_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" "+c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07c3930e756a68f77fad40f274248046b02cfe9f9e3a08524be3cccbeee8699e
[INFO] running `Command { std: "docker" "start" "-a" "07c3930e756a68f77fad40f274248046b02cfe9f9e3a08524be3cccbeee8699e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07c3930e756a68f77fad40f274248046b02cfe9f9e3a08524be3cccbeee8699e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07c3930e756a68f77fad40f274248046b02cfe9f9e3a08524be3cccbeee8699e", kill_on_drop: false }`
[INFO] [stdout] 07c3930e756a68f77fad40f274248046b02cfe9f9e3a08524be3cccbeee8699e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c6f1a85c8f06c93ddc6200caf413929a2e7e7dd6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a24e76b7ebf2f0a58931dd3a307fe2495248a54ddd81bcd9352bb7021fac9be4
[INFO] running `Command { std: "docker" "start" "-a" "a24e76b7ebf2f0a58931dd3a307fe2495248a54ddd81bcd9352bb7021fac9be4", kill_on_drop: false }`
[INFO] [stderr]     Checking learning_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `file` is never read
[INFO] [stdout]  --> src/read_file.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct DirElement {
[INFO] [stdout]   |            ---------- field in this struct
[INFO] [stdout] 8 |     pub name: String,
[INFO] [stdout] 9 |     pub file: Option<PathBuf>,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `DirElement` has a derived impl for the trait `Debug`, 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: field `file` is never read
[INFO] [stdout]  --> src/read_file.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct DirElement {
[INFO] [stdout]   |            ---------- field in this struct
[INFO] [stdout] 8 |     pub name: String,
[INFO] [stdout] 9 |     pub file: Option<PathBuf>,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `DirElement` has a derived impl for the trait `Debug`, 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: fields `name` and `dir` are never read
[INFO] [stdout]   --> src/read_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Directory {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 14 |     pub name: String,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 15 |     pub dir: Option<PathBuf>,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Directory` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `dir` are never read
[INFO] [stdout]   --> src/read_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Directory {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 14 |     pub name: String,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 15 |     pub dir: Option<PathBuf>,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Directory` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "a24e76b7ebf2f0a58931dd3a307fe2495248a54ddd81bcd9352bb7021fac9be4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a24e76b7ebf2f0a58931dd3a307fe2495248a54ddd81bcd9352bb7021fac9be4", kill_on_drop: false }`
[INFO] [stdout] a24e76b7ebf2f0a58931dd3a307fe2495248a54ddd81bcd9352bb7021fac9be4