[INFO] cloning repository https://github.com/megalypse/rust_collections_exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/megalypse/rust_collections_exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmegalypse%2Frust_collections_exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmegalypse%2Frust_collections_exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c9af602a140cb4262ddb1dbd3792be6c999b669d
[INFO] checking megalypse/rust_collections_exercise against try#9c1dcf141bc0875407c4eb36972857bd3db713e2 for pr-81863
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmegalypse%2Frust_collections_exercise" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/megalypse/rust_collections_exercise on toolchain 9c1dcf141bc0875407c4eb36972857bd3db713e2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/megalypse/rust_collections_exercise
[INFO] finished tweaking git repo https://github.com/megalypse/rust_collections_exercise
[INFO] tweaked toml for git repo https://github.com/megalypse/rust_collections_exercise written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/megalypse/rust_collections_exercise already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 00d8c8704ae9a2c3e07162ec878c9692145168ddf809501865efec66fb6aab54
[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" "00d8c8704ae9a2c3e07162ec878c9692145168ddf809501865efec66fb6aab54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "00d8c8704ae9a2c3e07162ec878c9692145168ddf809501865efec66fb6aab54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00d8c8704ae9a2c3e07162ec878c9692145168ddf809501865efec66fb6aab54", kill_on_drop: false }`
[INFO] [stdout] 00d8c8704ae9a2c3e07162ec878c9692145168ddf809501865efec66fb6aab54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9c1dcf141bc0875407c4eb36972857bd3db713e2" "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] 8a03167ca4ab9371e15a826af13e803a219677aecd977a3762cdc79b47dbab68
[INFO] running `Command { std: "docker" "start" "-a" "8a03167ca4ab9371e15a826af13e803a219677aecd977a3762cdc79b47dbab68", kill_on_drop: false }`
[INFO] [stderr]     Checking ch_8_exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]  --> src/meds/median.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut res = 0;
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `new_word` is never read
[INFO] [stdout]  --> src/pig_latim/pig_latimner.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut new_word = String::new();
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `res` is never read
[INFO] [stdout]  --> src/meds/median.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let mut res = 0;
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `new_word` is never read
[INFO] [stdout]  --> src/pig_latim/pig_latimner.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut new_word = String::new();
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[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 0.63s
[INFO] running `Command { std: "docker" "inspect" "8a03167ca4ab9371e15a826af13e803a219677aecd977a3762cdc79b47dbab68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a03167ca4ab9371e15a826af13e803a219677aecd977a3762cdc79b47dbab68", kill_on_drop: false }`
[INFO] [stdout] 8a03167ca4ab9371e15a826af13e803a219677aecd977a3762cdc79b47dbab68