[INFO] cloning repository https://github.com/JeffLi01/learn_rust_by_test
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JeffLi01/learn_rust_by_test" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJeffLi01%2Flearn_rust_by_test", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJeffLi01%2Flearn_rust_by_test'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cc3e261e18602f360bf4d35441cf13311c10077d
[INFO] checking JeffLi01/learn_rust_by_test against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJeffLi01%2Flearn_rust_by_test" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JeffLi01/learn_rust_by_test on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JeffLi01/learn_rust_by_test
[INFO] finished tweaking git repo https://github.com/JeffLi01/learn_rust_by_test
[INFO] tweaked toml for git repo https://github.com/JeffLi01/learn_rust_by_test written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/JeffLi01/learn_rust_by_test 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded inflate v0.2.0
[INFO] [stderr]   Downloaded structview v1.1.0
[INFO] [stderr]   Downloaded structview_derive v1.1.0
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[INFO] [stderr]   Downloaded png v0.7.0
[INFO] [stderr]   Downloaded num-bigint v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fee19e46ad9a639c5aef09a238f1ce68d3c2d10e9e9381d24d649b0f6e511db9
[INFO] running `Command { std: "docker" "start" "-a" "fee19e46ad9a639c5aef09a238f1ce68d3c2d10e9e9381d24d649b0f6e511db9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fee19e46ad9a639c5aef09a238f1ce68d3c2d10e9e9381d24d649b0f6e511db9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fee19e46ad9a639c5aef09a238f1ce68d3c2d10e9e9381d24d649b0f6e511db9", kill_on_drop: false }`
[INFO] [stdout] fee19e46ad9a639c5aef09a238f1ce68d3c2d10e9e9381d24d649b0f6e511db9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9f7f6399e96baf078e47a341c359b78d180d13c8bc78388d7c34c5608ad80afa
[INFO] running `Command { std: "docker" "start" "-a" "9f7f6399e96baf078e47a341c359b78d180d13c8bc78388d7c34c5608ad80afa", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling libc v0.2.106
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling num-bigint v0.4.2
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling syn v1.0.69
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]     Checking inflate v0.2.0
[INFO] [stderr]     Checking deflate v0.7.20
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking lzw v0.10.0
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[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num-complex v0.4.0
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[INFO] [stderr]     Checking crossbeam-channel v0.5.1
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[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]    Compiling structview_derive v1.1.0
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[INFO] [stderr]     Checking image v0.13.0
[INFO] [stderr]     Checking structview v1.1.0
[INFO] [stderr]     Checking learn_rust_by_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::string::ToString`
[INFO] [stdout]  --> examples/macro/macros.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub use std::string::ToString;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Animal` is never constructed
[INFO] [stdout]  --> src/learn_structview.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Animal {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.63s
[INFO] running `Command { std: "docker" "inspect" "9f7f6399e96baf078e47a341c359b78d180d13c8bc78388d7c34c5608ad80afa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f7f6399e96baf078e47a341c359b78d180d13c8bc78388d7c34c5608ad80afa", kill_on_drop: false }`
[INFO] [stdout] 9f7f6399e96baf078e47a341c359b78d180d13c8bc78388d7c34c5608ad80afa