[INFO] cloning repository https://github.com/ggggxiaolong/rust_course_code
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ggggxiaolong/rust_course_code" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fggggxiaolong%2Frust_course_code", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fggggxiaolong%2Frust_course_code'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 902da18329158327934935193c2c0ddd1e89b4bf
[INFO] testing ggggxiaolong/rust_course_code against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fggggxiaolong%2Frust_course_code" "/workspace/builds/worker-51/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-51/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ggggxiaolong/rust_course_code on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ggggxiaolong/rust_course_code
[INFO] finished tweaking git repo https://github.com/ggggxiaolong/rust_course_code
[INFO] tweaked toml for git repo https://github.com/ggggxiaolong/rust_course_code written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] crate git repo https://github.com/ggggxiaolong/rust_course_code already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 37750d37f5a021ce11c25e3575a4170c2d457cf281a7f7e7a1c603edd30a7f93
[INFO] running `Command { std: "docker" "start" "-a" "37750d37f5a021ce11c25e3575a4170c2d457cf281a7f7e7a1c603edd30a7f93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "37750d37f5a021ce11c25e3575a4170c2d457cf281a7f7e7a1c603edd30a7f93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37750d37f5a021ce11c25e3575a4170c2d457cf281a7f7e7a1c603edd30a7f93", kill_on_drop: false }`
[INFO] [stdout] 37750d37f5a021ce11c25e3575a4170c2d457cf281a7f7e7a1c603edd30a7f93
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 56c7cb123c2ff6a81edd62112dfb2fceadbca3ffa25647a7efe9cd2e82094687
[INFO] running `Command { std: "docker" "start" "-a" "56c7cb123c2ff6a81edd62112dfb2fceadbca3ffa25647a7efe9cd2e82094687", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust_course_code v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.31s
[INFO] running `Command { std: "docker" "inspect" "56c7cb123c2ff6a81edd62112dfb2fceadbca3ffa25647a7efe9cd2e82094687", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56c7cb123c2ff6a81edd62112dfb2fceadbca3ffa25647a7efe9cd2e82094687", kill_on_drop: false }`
[INFO] [stdout] 56c7cb123c2ff6a81edd62112dfb2fceadbca3ffa25647a7efe9cd2e82094687
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c68ece18e56ec79629a48222ea5999cd5ce50cc5972c173a8fffa1050fa6c01d
[INFO] running `Command { std: "docker" "start" "-a" "c68ece18e56ec79629a48222ea5999cd5ce50cc5972c173a8fffa1050fa6c01d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust_course_code v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/2_0_basic_concept.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut c = 30i32;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 26.02s
[INFO] running `Command { std: "docker" "inspect" "c68ece18e56ec79629a48222ea5999cd5ce50cc5972c173a8fffa1050fa6c01d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c68ece18e56ec79629a48222ea5999cd5ce50cc5972c173a8fffa1050fa6c01d", kill_on_drop: false }`
[INFO] [stdout] c68ece18e56ec79629a48222ea5999cd5ce50cc5972c173a8fffa1050fa6c01d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f7083b9607509f7c845fed3a9d4429515d5b6a5a202b26a25e2b5a549796523d
[INFO] running `Command { std: "docker" "start" "-a" "f7083b9607509f7c845fed3a9d4429515d5b6a5a202b26a25e2b5a549796523d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> examples/2_0_basic_concept.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let mut c = 30i32;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_course_code` (example "2_0_basic_concept") generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 7.68s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_course_code-12288863b8bef9b1)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f7083b9607509f7c845fed3a9d4429515d5b6a5a202b26a25e2b5a549796523d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7083b9607509f7c845fed3a9d4429515d5b6a5a202b26a25e2b5a549796523d", kill_on_drop: false }`
[INFO] [stdout] f7083b9607509f7c845fed3a9d4429515d5b6a5a202b26a25e2b5a549796523d