[INFO] updating cached repository https://github.com/cmaves/collage-bg
[INFO] running `"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"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 838da633950b7d4424905eba2f732a57c8607373
[INFO] checking cmaves/collage-bg against master#3dbade652ed8ebac70f903e01f51cd92c4e4302c for pr-69880
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcmaves%2Fcollage-bg" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cmaves/collage-bg on toolchain 3dbade652ed8ebac70f903e01f51cd92c4e4302c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/cmaves/collage-bg
[INFO] finished tweaking git repo https://github.com/cmaves/collage-bg
[INFO] tweaked toml for git repo https://github.com/cmaves/collage-bg written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/cmaves/collage-bg already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "/opt/rustwide/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 47458b4ab511d284adcdfa009b503e859b6332356a41169dfe26f0042dbcca5a
[INFO] running `"docker" "start" "-a" "47458b4ab511d284adcdfa009b503e859b6332356a41169dfe26f0042dbcca5a"`
[INFO] [stderr]    Compiling xcb v0.9.0
[INFO] [stderr]     Checking png v0.15.3
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stderr]     Checking tiff v0.3.1
[INFO] [stderr]     Checking image v0.22.5
[INFO] [stderr]     Checking bg-setter v0.1.0 (https://github.com/cmaves/bg-setter#56ee92f8)
[INFO] [stderr]     Checking collage-bg v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `SliceRandom`
[INFO] [stderr]  --> src/lib.rs:2:46
[INFO] [stderr]   |
[INFO] [stderr] 2 | use rand::prelude::{thread_rng,ThreadRng,Rng,SliceRandom};
[INFO] [stderr]   |                                              ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DirEntry`
[INFO] [stderr]  --> src/lib.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::fs::{DirEntry,read_dir};
[INFO] [stderr]   |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `xcb::ConnError`
[INFO] [stderr]  --> src/lib.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use xcb::ConnError;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SliceRandom`
[INFO] [stderr]  --> src/lib.rs:2:46
[INFO] [stderr]   |
[INFO] [stderr] 2 | use rand::prelude::{thread_rng,ThreadRng,Rng,SliceRandom};
[INFO] [stderr]   |                                              ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `DirEntry`
[INFO] [stderr]  --> src/lib.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::fs::{DirEntry,read_dir};
[INFO] [stderr]   |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `xcb::ConnError`
[INFO] [stderr]  --> src/lib.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use xcb::ConnError;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:23:3
[INFO] [stderr]    |
[INFO] [stderr] 23 |         cg.replace_random(count % cg.lens());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:23:3
[INFO] [stderr]    |
[INFO] [stderr] 23 |         cg.replace_random(count % cg.lens());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.71s
[INFO] running `"docker" "inspect" "47458b4ab511d284adcdfa009b503e859b6332356a41169dfe26f0042dbcca5a"`
[INFO] running `"docker" "rm" "-f" "47458b4ab511d284adcdfa009b503e859b6332356a41169dfe26f0042dbcca5a"`
[INFO] [stdout] 47458b4ab511d284adcdfa009b503e859b6332356a41169dfe26f0042dbcca5a