[INFO] updating cached repository https://github.com/coeuvre/rust-2048
[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] 9318fefff673888ce11098a37f7c95dd7dbbbfda
[INFO] checking coeuvre/rust-2048 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcoeuvre%2Frust-2048" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/coeuvre/rust-2048 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/coeuvre/rust-2048
[INFO] finished tweaking git repo https://github.com/coeuvre/rust-2048
[INFO] tweaked toml for git repo https://github.com/coeuvre/rust-2048 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/coeuvre/rust-2048 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /workspace/builds/worker-6/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 71b00a33e337a0cd6b701d74ee85271cc9169785a19b82b7719d97840b05a0bd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "71b00a33e337a0cd6b701d74ee85271cc9169785a19b82b7719d97840b05a0bd"`
[INFO] [stderr]     Checking pistoncore-input v0.15.0
[INFO] [stderr]     Checking piston2d-graphics v0.19.0
[INFO] [stderr]     Checking sdl2-sys v0.27.3
[INFO] [stderr]     Checking gfx_core v0.5.1
[INFO] [stderr]    Compiling glutin v0.7.4
[INFO] [stderr]     Checking memmap v0.4.0
[INFO] [stderr]     Checking png v0.6.2
[INFO] [stderr]     Checking rayon-core v1.6.0
[INFO] [stderr]     Checking wayland-sys v0.7.8
[INFO] [stderr]     Checking wayland-client v0.7.8
[INFO] [stderr]     Checking pistoncore-window v0.24.0
[INFO] [stderr]     Checking sdl2 v0.27.3
[INFO] [stderr]     Checking rayon v1.2.0
[INFO] [stderr]     Checking pistoncore-event_loop v0.27.0
[INFO] [stderr]     Checking wayland-window v0.4.4
[INFO] [stderr]     Checking wayland-kbd v0.6.3
[INFO] [stderr]     Checking piston v0.27.0
[INFO] [stderr]     Checking winit v0.5.11
[INFO] [stderr]     Checking pistoncore-sdl2_window v0.38.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.16
[INFO] [stderr]     Checking image v0.12.4
[INFO] [stderr]     Checking pistoncore-glutin_window v0.33.0
[INFO] [stderr]     Checking piston2d-opengl_graphics v0.37.0
[INFO] [stderr]     Checking gfx v0.13.0
[INFO] [stderr]     Checking gfx_device_gl v0.12.0
[INFO] [stderr]     Checking piston-gfx_texture v0.20.0
[INFO] [stderr]     Checking piston2d-gfx_graphics v0.35.0
[INFO] [stderr]     Checking piston_window v0.61.0
[INFO] [stderr]     Checking rust-2048 v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: the item `Key` is imported redundantly
[INFO] [stderr]    --> src/app.rs:108:7
[INFO] [stderr]     |
[INFO] [stderr] 3   | use piston_window::*;
[INFO] [stderr]     |     ---------------- the item `Key` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 108 |         use piston_window::Key;        
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Encodable`
[INFO] [stderr]  --> src/settings.rs:6:30
[INFO] [stderr]   |
[INFO] [stderr] 6 | use rustc_serialize::{ json, Encodable, Decodable };
[INFO] [stderr]   |                              ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Key` is imported redundantly
[INFO] [stderr]    --> src/app.rs:108:7
[INFO] [stderr]     |
[INFO] [stderr] 3   | use piston_window::*;
[INFO] [stderr]     |     ---------------- the item `Key` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 108 |         use piston_window::Key;        
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Encodable`
[INFO] [stderr]  --> src/settings.rs:6:30
[INFO] [stderr]   |
[INFO] [stderr] 6 | use rustc_serialize::{ json, Encodable, Decodable };
[INFO] [stderr]   |                              ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 58.01s
[INFO] running `"docker" "inspect" "71b00a33e337a0cd6b701d74ee85271cc9169785a19b82b7719d97840b05a0bd"`
[INFO] running `"docker" "rm" "-f" "71b00a33e337a0cd6b701d74ee85271cc9169785a19b82b7719d97840b05a0bd"`
[INFO] [stdout] 71b00a33e337a0cd6b701d74ee85271cc9169785a19b82b7719d97840b05a0bd