[INFO] cloning repository https://github.com/pemistahl/grex
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pemistahl/grex" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpemistahl%2Fgrex", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpemistahl%2Fgrex'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1adf8ed91af38c831d49fa112a2d9bd78cf5c777
[INFO] checking pemistahl/grex against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpemistahl%2Fgrex" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/pemistahl/grex on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/pemistahl/grex
[INFO] finished tweaking git repo https://github.com/pemistahl/grex
[INFO] tweaked toml for git repo https://github.com/pemistahl/grex written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/pemistahl/grex already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9c9662fc41bb1fc70bd2c867e8598bf84fad5b15f55f3e40e75d87c5d5e08fa3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9c9662fc41bb1fc70bd2c867e8598bf84fad5b15f55f3e40e75d87c5d5e08fa3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c9662fc41bb1fc70bd2c867e8598bf84fad5b15f55f3e40e75d87c5d5e08fa3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c9662fc41bb1fc70bd2c867e8598bf84fad5b15f55f3e40e75d87c5d5e08fa3", kill_on_drop: false }`
[INFO] [stdout] 9c9662fc41bb1fc70bd2c867e8598bf84fad5b15f55f3e40e75d87c5d5e08fa3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 035d8da0e2d8e91829513c1427bf8ab6064b7189fc68080b33d1e595e7a8ae10
[INFO] running `Command { std: "docker" "start" "-a" "035d8da0e2d8e91829513c1427bf8ab6064b7189fc68080b33d1e595e7a8ae10", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking unic-ucd-category v0.9.0
[INFO] [stderr]    Compiling rstest v0.6.2
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]     Checking petgraph v0.5.0
[INFO] [stderr]     Checking regex v1.3.6
[INFO] [stderr]     Checking rusty-fork v0.2.2
[INFO] [stderr]     Checking ndarray v0.13.0
[INFO] [stderr]     Checking predicates v1.0.4
[INFO] [stderr]     Checking proptest v0.9.6
[INFO] [stderr]     Checking assert_cmd v1.0.1
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]    Compiling structopt-derive v0.4.6
[INFO] [stderr]     Checking structopt v0.3.13
[INFO] [stderr]     Checking grex v1.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/regexp/regexp.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 | /         std::mem::replace(
[INFO] [stdout] 48 | |             test_cases,
[INFO] [stdout] 49 | |             test_cases.iter().map(|it| it.to_lowercase()).collect_vec(),
[INFO] [stdout] 50 | |         );
[INFO] [stdout]    | |__________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/regexp/regexp.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 | /         std::mem::replace(
[INFO] [stdout] 48 | |             test_cases,
[INFO] [stdout] 49 | |             test_cases.iter().map(|it| it.to_lowercase()).collect_vec(),
[INFO] [stdout] 50 | |         );
[INFO] [stdout]    | |__________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 54.59s
[INFO] running `Command { std: "docker" "inspect" "035d8da0e2d8e91829513c1427bf8ab6064b7189fc68080b33d1e595e7a8ae10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "035d8da0e2d8e91829513c1427bf8ab6064b7189fc68080b33d1e595e7a8ae10", kill_on_drop: false }`
[INFO] [stdout] 035d8da0e2d8e91829513c1427bf8ab6064b7189fc68080b33d1e595e7a8ae10