[INFO] cloning repository https://github.com/ashwinsekaran/rust_smartpointers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ashwinsekaran/rust_smartpointers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fashwinsekaran%2Frust_smartpointers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fashwinsekaran%2Frust_smartpointers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 32ea09db5aa3749e9c7e16949e578c4438da1ce1
[INFO] checking ashwinsekaran/rust_smartpointers against try#d83b14207998f47b18a34e930157ac0d7c18b16e for pr-149137
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fashwinsekaran%2Frust_smartpointers" "/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/ashwinsekaran/rust_smartpointers
[INFO] finished tweaking git repo https://github.com/ashwinsekaran/rust_smartpointers
[INFO] tweaked toml for git repo https://github.com/ashwinsekaran/rust_smartpointers written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ashwinsekaran/rust_smartpointers on toolchain d83b14207998f47b18a34e930157ac0d7c18b16e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d83b14207998f47b18a34e930157ac0d7c18b16e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ashwinsekaran/rust_smartpointers 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" "+d83b14207998f47b18a34e930157ac0d7c18b16e" "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 ashwinsekaran/rust_smartpointers against try#d83b14207998f47b18a34e930157ac0d7c18b16e for pr-149137
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fashwinsekaran%2Frust_smartpointers" "/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/ashwinsekaran/rust_smartpointers
[INFO] finished tweaking git repo https://github.com/ashwinsekaran/rust_smartpointers
[INFO] tweaked toml for git repo https://github.com/ashwinsekaran/rust_smartpointers written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ashwinsekaran/rust_smartpointers on toolchain d83b14207998f47b18a34e930157ac0d7c18b16e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d83b14207998f47b18a34e930157ac0d7c18b16e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ashwinsekaran/rust_smartpointers 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" "+d83b14207998f47b18a34e930157ac0d7c18b16e" "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-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+d83b14207998f47b18a34e930157ac0d7c18b16e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1ebf877e6af1728ca10c4c83ca9c00a4f07375726fcb054decf7e6c1e4bc7351
[INFO] running `Command { std: "docker" "start" "-a" "1ebf877e6af1728ca10c4c83ca9c00a4f07375726fcb054decf7e6c1e4bc7351", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ebf877e6af1728ca10c4c83ca9c00a4f07375726fcb054decf7e6c1e4bc7351", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ebf877e6af1728ca10c4c83ca9c00a4f07375726fcb054decf7e6c1e4bc7351", kill_on_drop: false }`
[INFO] [stdout] 1ebf877e6af1728ca10c4c83ca9c00a4f07375726fcb054decf7e6c1e4bc7351
[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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+d83b14207998f47b18a34e930157ac0d7c18b16e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a62039d0baa1a0ab274ec5f66c50059d9b3aa2dfc4fb707faf977a5061715ffb
[INFO] running `Command { std: "docker" "start" "-a" "a62039d0baa1a0ab274ec5f66c50059d9b3aa2dfc4fb707faf977a5061715ffb", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_smartpointers v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:192:7
[INFO] [stdout]     |
[INFO] [stdout] 192 |  Cons(Rc<RefCell<String>>,Rc<List>),  
[INFO] [stdout]     |  ---- ^^^^^^^^^^^^^^^^^^^ ^^^^^^^^
[INFO] [stdout]     |  |
[INFO] [stdout]     |  fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 192 -  Cons(Rc<RefCell<String>>,Rc<List>),  
[INFO] [stdout] 192 +  Cons((),()),  
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:192:7
[INFO] [stdout]     |
[INFO] [stdout] 192 |  Cons(Rc<RefCell<String>>,Rc<List>),  
[INFO] [stdout]     |  ---- ^^^^^^^^^^^^^^^^^^^ ^^^^^^^^
[INFO] [stdout]     |  |
[INFO] [stdout]     |  fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 192 -  Cons(Rc<RefCell<String>>,Rc<List>),  
[INFO] [stdout] 192 +  Cons((),()),  
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "a62039d0baa1a0ab274ec5f66c50059d9b3aa2dfc4fb707faf977a5061715ffb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a62039d0baa1a0ab274ec5f66c50059d9b3aa2dfc4fb707faf977a5061715ffb", kill_on_drop: false }`
[INFO] [stdout] a62039d0baa1a0ab274ec5f66c50059d9b3aa2dfc4fb707faf977a5061715ffb