[INFO] updating cached repository https://github.com/masa-suzu/rson
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2e3754c5d2445350340333b94cecf2dfb2f82198
[INFO] checking masa-suzu/rson against try#85cc1486e1f000dce4bb8e1b3cfab2b654b102a8 for pr-73323
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasa-suzu%2Frson" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/masa-suzu/rson on toolchain 85cc1486e1f000dce4bb8e1b3cfab2b654b102a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/masa-suzu/rson
[INFO] finished tweaking git repo https://github.com/masa-suzu/rson
[INFO] tweaked toml for git repo https://github.com/masa-suzu/rson written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/masa-suzu/rson already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5e320d09f93bce656b55db923f29d7f2346e44f531d22a27ab9ca8ff20a4658d
[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" "5e320d09f93bce656b55db923f29d7f2346e44f531d22a27ab9ca8ff20a4658d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5e320d09f93bce656b55db923f29d7f2346e44f531d22a27ab9ca8ff20a4658d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e320d09f93bce656b55db923f29d7f2346e44f531d22a27ab9ca8ff20a4658d", kill_on_drop: false }`
[INFO] [stdout] 5e320d09f93bce656b55db923f29d7f2346e44f531d22a27ab9ca8ff20a4658d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8cf3a8b8c6c601b4952a97ffd0d18c7bb3d351420d71e7f1d7e53ff6c8326607
[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" "8cf3a8b8c6c601b4952a97ffd0d18c7bb3d351420d71e7f1d7e53ff6c8326607", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling ryu v0.2.8
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking static_assertions v0.2.5
[INFO] [stderr]     Checking memchr v2.2.1
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling nom v5.0.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling stackvector v1.0.6
[INFO] [stderr]    Compiling lexical-core v0.4.2
[INFO] [stderr]     Checking rson v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/ep.rs:84:28
[INFO] [stdout]    |
[INFO] [stdout] 84 |             Ok(Root::Array(a)) => unreachable!(),
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.04s
[INFO] running `Command { std: "docker" "inspect" "8cf3a8b8c6c601b4952a97ffd0d18c7bb3d351420d71e7f1d7e53ff6c8326607", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8cf3a8b8c6c601b4952a97ffd0d18c7bb3d351420d71e7f1d7e53ff6c8326607", kill_on_drop: false }`
[INFO] [stdout] 8cf3a8b8c6c601b4952a97ffd0d18c7bb3d351420d71e7f1d7e53ff6c8326607