[INFO] cloning repository https://github.com/Fta1d/key-value-db-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Fta1d/key-value-db-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFta1d%2Fkey-value-db-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFta1d%2Fkey-value-db-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 37b1d081f9a5371a3ee86992d978946af70d792e
[INFO] checking Fta1d/key-value-db-rust against try#e5b0618d996a6a3941e423fd3e170737b8dbdc92 for pr-151822
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFta1d%2Fkey-value-db-rust" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Fta1d/key-value-db-rust
[INFO] finished tweaking git repo https://github.com/Fta1d/key-value-db-rust
[INFO] tweaked toml for git repo https://github.com/Fta1d/key-value-db-rust written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Fta1d/key-value-db-rust on toolchain e5b0618d996a6a3941e423fd3e170737b8dbdc92
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Fta1d/key-value-db-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" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:29356a839a4d14451438f794ce8414e707d72405f44418718d724d22562fe786" "/opt/rustwide/cargo-home/bin/cargo" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4daa00682e7366e80539d6e64dca2533f7b4813cc9ed6957ae5ffeb3bcd00c1f
[INFO] running `Command { std: "docker" "start" "-a" "4daa00682e7366e80539d6e64dca2533f7b4813cc9ed6957ae5ffeb3bcd00c1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4daa00682e7366e80539d6e64dca2533f7b4813cc9ed6957ae5ffeb3bcd00c1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4daa00682e7366e80539d6e64dca2533f7b4813cc9ed6957ae5ffeb3bcd00c1f", kill_on_drop: false }`
[INFO] [stdout] 4daa00682e7366e80539d6e64dca2533f7b4813cc9ed6957ae5ffeb3bcd00c1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:29356a839a4d14451438f794ce8414e707d72405f44418718d724d22562fe786" "/opt/rustwide/cargo-home/bin/cargo" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa6684ef4e9b0862c43e46aae33bd98d88bda98405ba628b344092e78c880bc1
[INFO] running `Command { std: "docker" "start" "-a" "fa6684ef4e9b0862c43e46aae33bd98d88bda98405ba628b344092e78c880bc1", kill_on_drop: false }`
[INFO] [stderr]     Checking key-value_db v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |             writeln!(writer, "{db_key}={db_val}");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 51 |             let _ = writeln!(writer, "{db_key}={db_val}");
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |             writeln!(writer, "{db_key}={db_val}");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 51 |             let _ = writeln!(writer, "{db_key}={db_val}");
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "fa6684ef4e9b0862c43e46aae33bd98d88bda98405ba628b344092e78c880bc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa6684ef4e9b0862c43e46aae33bd98d88bda98405ba628b344092e78c880bc1", kill_on_drop: false }`
[INFO] [stdout] fa6684ef4e9b0862c43e46aae33bd98d88bda98405ba628b344092e78c880bc1