[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 try#0ab79c4b48ad19260fa46623f452c1b403a360e8 for pr-74315
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomwhoiscontrary%2Fisots" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tomwhoiscontrary/isots on toolchain 0ab79c4b48ad19260fa46623f452c1b403a360e8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "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-13/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" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8035bac84c3ab75720d8d1bf72d24637469b727de50985d36f7f6de19fccc97e
[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" "8035bac84c3ab75720d8d1bf72d24637469b727de50985d36f7f6de19fccc97e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8035bac84c3ab75720d8d1bf72d24637469b727de50985d36f7f6de19fccc97e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8035bac84c3ab75720d8d1bf72d24637469b727de50985d36f7f6de19fccc97e", kill_on_drop: false }`
[INFO] [stdout] 8035bac84c3ab75720d8d1bf72d24637469b727de50985d36f7f6de19fccc97e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a23c365b67d11d5f40fdbf97a7846158179b21cd6103371da59678e11dce4ea9
[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" "a23c365b67d11d5f40fdbf97a7846158179b21cd6103371da59678e11dce4ea9", kill_on_drop: false }`
[INFO] [stderr]     Checking num-integer v0.1.39
[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$}Z",
[INFO] [stdout] 160 | |                time.year(),
[INFO] [stdout] 161 | |                time.month(),
[INFO] [stdout] ...   |
[INFO] [stdout] 166 | |                time.nanosecond(),
[INFO] [stdout] 167 | |                width = fractional_seconds_digits);
[INFO] [stdout]     | |__________________________________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:149:9
[INFO] [stdout]     |
[INFO] [stdout] 149 | /         write!(out,
[INFO] [stdout] 150 | |                "{}-{:02}-{:02}T{:02}:{:02}:{:02}Z",
[INFO] [stdout] 151 | |                time.year(),
[INFO] [stdout] 152 | |                time.month(),
[INFO] [stdout] ...   |
[INFO] [stdout] 155 | |                time.minute(),
[INFO] [stdout] 156 | |                time.second());
[INFO] [stdout]     | |______________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/main.rs:158:9
[INFO] [stdout]     |
[INFO] [stdout] 158 | /         write!(out,
[INFO] [stdout] 159 | |                "{}-{:02}-{:02}T{:02}:{:02}:{:02}.{:0width$}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: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.72s
[INFO] running `Command { std: "docker" "inspect" "a23c365b67d11d5f40fdbf97a7846158179b21cd6103371da59678e11dce4ea9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a23c365b67d11d5f40fdbf97a7846158179b21cd6103371da59678e11dce4ea9", kill_on_drop: false }`
[INFO] [stdout] a23c365b67d11d5f40fdbf97a7846158179b21cd6103371da59678e11dce4ea9