[INFO] cloning repository https://github.com/ilmoi/rust_learnings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ilmoi/rust_learnings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Filmoi%2Frust_learnings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Filmoi%2Frust_learnings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 466dcc45c4bc4ba292549c3b510f6168fc96eb19
[INFO] checking ilmoi/rust_learnings against try#b20a093d9fb1ffaa04ae9852cb034864a992bafd for pr-85073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Filmoi%2Frust_learnings" "/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/ilmoi/rust_learnings on toolchain b20a093d9fb1ffaa04ae9852cb034864a992bafd
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ilmoi/rust_learnings
[INFO] finished tweaking git repo https://github.com/ilmoi/rust_learnings
[INFO] tweaked toml for git repo https://github.com/ilmoi/rust_learnings written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ilmoi/rust_learnings already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "fetch" "--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-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8efa7536018acb13d3689e83e171d114b84602c451e41735757b66537b92227f
[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" "8efa7536018acb13d3689e83e171d114b84602c451e41735757b66537b92227f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8efa7536018acb13d3689e83e171d114b84602c451e41735757b66537b92227f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8efa7536018acb13d3689e83e171d114b84602c451e41735757b66537b92227f", kill_on_drop: false }`
[INFO] [stdout] 8efa7536018acb13d3689e83e171d114b84602c451e41735757b66537b92227f
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "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] 9a6ab10964702147da50da0aa6a9fa91535ce5577d1e7bc3ff36ebbbbcd51752
[INFO] running `Command { std: "docker" "start" "-a" "9a6ab10964702147da50da0aa6a9fa91535ce5577d1e7bc3ff36ebbbbcd51752", kill_on_drop: false }`
[INFO] [stderr]     Checking _learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/iterators/ryan_levick_iterators.rs:284:9
[INFO] [stdout]     |
[INFO] [stdout] 284 |     let mut mv2 = MyVecIterator::new(&mv).map(|x| x*5);
[INFO] [stdout]     |         ----^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `flatten`
[INFO] [stdout]  --> src/iterators/crust_of_rust_iterators.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn flatten<O>(iter: O) -> Flatten<O::IntoIter>
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/iterators/crust_of_rust_iterators.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn new(outer: O) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/iterators/ryan_levick_iterators.rs:284:9
[INFO] [stdout]     |
[INFO] [stdout] 284 |     let mut mv2 = MyVecIterator::new(&mv).map(|x| x*5);
[INFO] [stdout]     |         ----^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` 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 0.76s
[INFO] running `Command { std: "docker" "inspect" "9a6ab10964702147da50da0aa6a9fa91535ce5577d1e7bc3ff36ebbbbcd51752", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a6ab10964702147da50da0aa6a9fa91535ce5577d1e7bc3ff36ebbbbcd51752", kill_on_drop: false }`
[INFO] [stdout] 9a6ab10964702147da50da0aa6a9fa91535ce5577d1e7bc3ff36ebbbbcd51752