[INFO] cloning repository https://github.com/AlgorithmEnigma/grrs-tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AlgorithmEnigma/grrs-tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlgorithmEnigma%2Fgrrs-tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlgorithmEnigma%2Fgrrs-tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0c55a16ededc026ad355e80d26b6c7eeb90b7424
[INFO] checking AlgorithmEnigma/grrs-tutorial against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlgorithmEnigma%2Fgrrs-tutorial" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AlgorithmEnigma/grrs-tutorial on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AlgorithmEnigma/grrs-tutorial
[INFO] finished tweaking git repo https://github.com/AlgorithmEnigma/grrs-tutorial
[INFO] tweaked toml for git repo https://github.com/AlgorithmEnigma/grrs-tutorial written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/AlgorithmEnigma/grrs-tutorial 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded anyhow v1.0.45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 681fcadf19d4b5ed55902a19bfcfb124da27c2bb1e1ab00e813770586f1ced1d
[INFO] running `Command { std: "docker" "start" "-a" "681fcadf19d4b5ed55902a19bfcfb124da27c2bb1e1ab00e813770586f1ced1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "681fcadf19d4b5ed55902a19bfcfb124da27c2bb1e1ab00e813770586f1ced1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "681fcadf19d4b5ed55902a19bfcfb124da27c2bb1e1ab00e813770586f1ced1d", kill_on_drop: false }`
[INFO] [stdout] 681fcadf19d4b5ed55902a19bfcfb124da27c2bb1e1ab00e813770586f1ced1d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 36453e99f564855b193d77aa265e22dfab05cc3ffb8ee94f3eaa741eb4416627
[INFO] running `Command { std: "docker" "start" "-a" "36453e99f564855b193d77aa265e22dfab05cc3ffb8ee94f3eaa741eb4416627", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.107
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling anyhow v1.0.45
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking structopt v0.3.25
[INFO] [stderr]     Checking grrs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/main.rs:4:55
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, BufWriter, Write};
[INFO] [stdout]   |                     ----------                        ^^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Write` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Write` is imported redundantly
[INFO] [stdout]  --> src/main.rs:4:55
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, prelude::*, BufReader, BufWriter, Write};
[INFO] [stdout]   |                     ----------                        ^^^^^
[INFO] [stdout]   |                     |
[INFO] [stdout]   |                     the item `Write` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FileReadError` is never constructed
[INFO] [stdout]   --> src/main.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct FileReadError(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FileReadError` is never constructed
[INFO] [stdout]   --> src/main.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct FileReadError(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.02s
[INFO] running `Command { std: "docker" "inspect" "36453e99f564855b193d77aa265e22dfab05cc3ffb8ee94f3eaa741eb4416627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36453e99f564855b193d77aa265e22dfab05cc3ffb8ee94f3eaa741eb4416627", kill_on_drop: false }`
[INFO] [stdout] 36453e99f564855b193d77aa265e22dfab05cc3ffb8ee94f3eaa741eb4416627