[INFO] updating cached repository https://github.com/tomwhoiscontrary/isots
[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] 646f593552e1cbb620bc2c92c04e116d2a218e42
[INFO] checking tomwhoiscontrary/isots against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomwhoiscontrary%2Fisots" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tomwhoiscontrary/isots on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tomwhoiscontrary/isots
[INFO] finished tweaking git repo https://github.com/tomwhoiscontrary/isots
[INFO] tweaked toml for git repo https://github.com/tomwhoiscontrary/isots written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/tomwhoiscontrary/isots already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", 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] e6c5ab80ee0b82d317fa92f7434e15010b4e0fe1ce48c0f22c3f239a83d2128f
[INFO] running `Command { std: "docker" "start" "-a" "e6c5ab80ee0b82d317fa92f7434e15010b4e0fe1ce48c0f22c3f239a83d2128f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e6c5ab80ee0b82d317fa92f7434e15010b4e0fe1ce48c0f22c3f239a83d2128f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6c5ab80ee0b82d317fa92f7434e15010b4e0fe1ce48c0f22c3f239a83d2128f", kill_on_drop: false }`
[INFO] [stdout] e6c5ab80ee0b82d317fa92f7434e15010b4e0fe1ce48c0f22c3f239a83d2128f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b6372b447e6fb1f46b92b13995ffbfa9b1df8594e75385093536333b753412d
[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" "8b6372b447e6fb1f46b92b13995ffbfa9b1df8594e75385093536333b753412d", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking isots v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:149:9
[INFO] [stdout]     |
[INFO] [stdout] 149 | /         write!(out,
[INFO] [stdout] 150 | |                "{}-{:02}-{:02}T{:02}:{:02}:{:02}Z",
[INFO] [stdout] 151 | |                time.year(),
[INFO] [stdout] 152 | |                time.month(),
[INFO] [stdout] ...   |
[INFO] [stdout] 155 | |                time.minute(),
[INFO] [stdout] 156 | |                time.second());
[INFO] [stdout]     | |______________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 158 | /         write!(out,
[INFO] [stdout] 159 | |                "{}-{:02}-{:02}T{:02}:{:02}:{:02}.{:0width$}Z",
[INFO] [stdout] 160 | |                time.year(),
[INFO] [stdout] 161 | |                time.month(),
[INFO] [stdout] ...   |
[INFO] [stdout] 166 | |                time.nanosecond(),
[INFO] [stdout] 167 | |                width = fractional_seconds_digits);
[INFO] [stdout]     | |__________________________________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:149:9
[INFO] [stdout]     |
[INFO] [stdout] 149 | /         write!(out,
[INFO] [stdout] 150 | |                "{}-{:02}-{:02}T{:02}:{:02}:{:02}Z",
[INFO] [stdout] 151 | |                time.year(),
[INFO] [stdout] 152 | |                time.month(),
[INFO] [stdout] ...   |
[INFO] [stdout] 155 | |                time.minute(),
[INFO] [stdout] 156 | |                time.second());
[INFO] [stdout]     | |______________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 158 | /         write!(out,
[INFO] [stdout] 159 | |                "{}-{:02}-{:02}T{:02}:{:02}:{:02}.{:0width$}Z",
[INFO] [stdout] 160 | |                time.year(),
[INFO] [stdout] 161 | |                time.month(),
[INFO] [stdout] ...   |
[INFO] [stdout] 166 | |                time.nanosecond(),
[INFO] [stdout] 167 | |                width = fractional_seconds_digits);
[INFO] [stdout]     | |__________________________________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.14s
[INFO] running `Command { std: "docker" "inspect" "8b6372b447e6fb1f46b92b13995ffbfa9b1df8594e75385093536333b753412d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b6372b447e6fb1f46b92b13995ffbfa9b1df8594e75385093536333b753412d", kill_on_drop: false }`
[INFO] [stdout] 8b6372b447e6fb1f46b92b13995ffbfa9b1df8594e75385093536333b753412d