[INFO] cloning repository https://github.com/u238/traits_exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/u238/traits_exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu238%2Ftraits_exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu238%2Ftraits_exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b4d2ec668ba73d8123a0538c766117dbe9238423
[INFO] checking u238/traits_exercise against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu238%2Ftraits_exercise" "/workspace/builds/worker-94/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-94/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/u238/traits_exercise on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/u238/traits_exercise
[INFO] finished tweaking git repo https://github.com/u238/traits_exercise
[INFO] tweaked toml for git repo https://github.com/u238/traits_exercise written to /workspace/builds/worker-94/source/Cargo.toml
[INFO] crate git repo https://github.com/u238/traits_exercise already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "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-94/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-94/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c1b53ee06eefb7e8f04ccc6075b58319d7af6d21e8b57eec48db9b71df17f8fb
[INFO] running `Command { std: "docker" "start" "-a" "c1b53ee06eefb7e8f04ccc6075b58319d7af6d21e8b57eec48db9b71df17f8fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1b53ee06eefb7e8f04ccc6075b58319d7af6d21e8b57eec48db9b71df17f8fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1b53ee06eefb7e8f04ccc6075b58319d7af6d21e8b57eec48db9b71df17f8fb", kill_on_drop: false }`
[INFO] [stdout] c1b53ee06eefb7e8f04ccc6075b58319d7af6d21e8b57eec48db9b71df17f8fb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-94/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-94/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe1349bf23500bec45d2d87e58c4708c9b774bb8b460eda1600cee4fe39b9caa
[INFO] running `Command { std: "docker" "start" "-a" "fe1349bf23500bec45d2d87e58c4708c9b774bb8b460eda1600cee4fe39b9caa", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking traits_exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/main.rs:30:24
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn mapr(&mut self, fn(i64) -> i64);
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: fn(i64) -> i64`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/main.rs:30:24
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn mapr(&mut self, fn(i64) -> i64);
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: fn(i64) -> i64`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.91s
[INFO] running `Command { std: "docker" "inspect" "fe1349bf23500bec45d2d87e58c4708c9b774bb8b460eda1600cee4fe39b9caa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe1349bf23500bec45d2d87e58c4708c9b774bb8b460eda1600cee4fe39b9caa", kill_on_drop: false }`
[INFO] [stdout] fe1349bf23500bec45d2d87e58c4708c9b774bb8b460eda1600cee4fe39b9caa