[INFO] cloning repository https://github.com/JubrilKolade/100-days-of-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JubrilKolade/100-days-of-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJubrilKolade%2F100-days-of-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJubrilKolade%2F100-days-of-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a9c71510c2fb01e90f02a3e0426ccf5cde1bde46
[INFO] checking JubrilKolade/100-days-of-rust against try#5de9e0e6cf775e94e0de2003f35e183f3f77bfe8 for pr-143808
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJubrilKolade%2F100-days-of-rust" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/JubrilKolade/100-days-of-rust
[INFO] finished tweaking git repo https://github.com/JubrilKolade/100-days-of-rust
[INFO] tweaked toml for git repo https://github.com/JubrilKolade/100-days-of-rust written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/JubrilKolade/100-days-of-rust on toolchain 5de9e0e6cf775e94e0de2003f35e183f3f77bfe8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5de9e0e6cf775e94e0de2003f35e183f3f77bfe8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/JubrilKolade/100-days-of-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" "+5de9e0e6cf775e94e0de2003f35e183f3f77bfe8" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+5de9e0e6cf775e94e0de2003f35e183f3f77bfe8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d9e2806b1471693489bc63363445e3ec5c5a1c3aec6dce70fd642cdf6ad1ded0
[INFO] running `Command { std: "docker" "start" "-a" "d9e2806b1471693489bc63363445e3ec5c5a1c3aec6dce70fd642cdf6ad1ded0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d9e2806b1471693489bc63363445e3ec5c5a1c3aec6dce70fd642cdf6ad1ded0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9e2806b1471693489bc63363445e3ec5c5a1c3aec6dce70fd642cdf6ad1ded0", kill_on_drop: false }`
[INFO] [stdout] d9e2806b1471693489bc63363445e3ec5c5a1c3aec6dce70fd642cdf6ad1ded0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+5de9e0e6cf775e94e0de2003f35e183f3f77bfe8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b6a681e33fa9ac49f31687205b47756d4e9f70f8814e3860990eec3222f31799
[INFO] running `Command { std: "docker" "start" "-a" "b6a681e33fa9ac49f31687205b47756d4e9f70f8814e3860990eec3222f31799", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-100 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: argument never used
[INFO] [stdout]    --> src/main.rs:501:36
[INFO] [stdout]     |
[INFO] [stdout] 501 |     println!("{:?}, {:?}", s1, s2, t); // -> "hello", "world", ("hello", "world")
[INFO] [stdout]     |              ------------          ^ argument never used
[INFO] [stdout]     |              |
[INFO] [stdout]     |              formatting specifier missing
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: argument never used
[INFO] [stdout]    --> src/main.rs:501:36
[INFO] [stdout]     |
[INFO] [stdout] 501 |     println!("{:?}, {:?}", s1, s2, t); // -> "hello", "world", ("hello", "world")
[INFO] [stdout]     |              ------------          ^ argument never used
[INFO] [stdout]     |              |
[INFO] [stdout]     |              formatting specifier missing
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:427:6
[INFO] [stdout]     |
[INFO] [stdout] 427 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:427:6
[INFO] [stdout]     |
[INFO] [stdout] 427 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     y = 15; // reassigns value to y
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     y = 15; // reassigns value to y
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/main.rs:75:5
[INFO] [stdout]    |
[INFO] [stdout] 75 |     x += 3;
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]    --> src/main.rs:108:6
[INFO] [stdout]     |
[INFO] [stdout] 108 |      y = x;
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/main.rs:75:5
[INFO] [stdout]    |
[INFO] [stdout] 75 |     x += 3;
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]    --> src/main.rs:108:6
[INFO] [stdout]     |
[INFO] [stdout] 108 |      y = x;
[INFO] [stdout]     |      ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-100` (bin "rust-100") due to 1 previous error; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rust-100` (bin "rust-100" test) due to 1 previous error; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b6a681e33fa9ac49f31687205b47756d4e9f70f8814e3860990eec3222f31799", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6a681e33fa9ac49f31687205b47756d4e9f70f8814e3860990eec3222f31799", kill_on_drop: false }`
[INFO] [stdout] b6a681e33fa9ac49f31687205b47756d4e9f70f8814e3860990eec3222f31799