[INFO] cloning repository https://github.com/bebrws/rust-piston-2d-square-fps
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bebrws/rust-piston-2d-square-fps" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbebrws%2Frust-piston-2d-square-fps", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbebrws%2Frust-piston-2d-square-fps'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e137b790e4799cf0dd79bda351ec2b93b0e213e6
[INFO] checking bebrws/rust-piston-2d-square-fps against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbebrws%2Frust-piston-2d-square-fps" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bebrws/rust-piston-2d-square-fps on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bebrws/rust-piston-2d-square-fps
[INFO] finished tweaking git repo https://github.com/bebrws/rust-piston-2d-square-fps
[INFO] tweaked toml for git repo https://github.com/bebrws/rust-piston-2d-square-fps written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/bebrws/rust-piston-2d-square-fps already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "a6bb76ebf2b68cbf1ed6d76daf8c13756423a97478c23fdfc577db11e17692cf", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "6f41b3e93957fa60e35c5123d4749afc349ee418fbeb2b8919f6533197ab9caf", kill_on_drop: false }`
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[INFO] [stderr]     Checking rust-piston-2d-square-fps v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 | /             text::Text::new_color([0.4, 0.2, 0.3, 1.0], 12).draw(&fps_string,
[INFO] [stdout] 56 | |                                                                  &mut glyphes,
[INFO] [stdout] 57 | |                                                                  &c.draw_state,
[INFO] [stdout] 58 | |                                                                  c.transform.trans(10.0, 10.0),
[INFO] [stdout] 59 | |                                                                  gl);
[INFO] [stdout]    | |____________________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |             let _ = text::Text::new_color([0.4, 0.2, 0.3, 1.0], 12).draw(&fps_string,
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 | /             text::Text::new_color([0.4, 0.2, 0.3, 1.0], 12).draw(&fps_string,
[INFO] [stdout] 56 | |                                                                  &mut glyphes,
[INFO] [stdout] 57 | |                                                                  &c.draw_state,
[INFO] [stdout] 58 | |                                                                  c.transform.trans(10.0, 10.0),
[INFO] [stdout] 59 | |                                                                  gl);
[INFO] [stdout]    | |____________________________________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |             let _ = text::Text::new_color([0.4, 0.2, 0.3, 1.0], 12).draw(&fps_string,
[INFO] [stdout]    |             +++++++
[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` profile [unoptimized + debuginfo] target(s) in 13.31s
[INFO] running `Command { std: "docker" "inspect" "6f41b3e93957fa60e35c5123d4749afc349ee418fbeb2b8919f6533197ab9caf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f41b3e93957fa60e35c5123d4749afc349ee418fbeb2b8919f6533197ab9caf", kill_on_drop: false }`
[INFO] [stdout] 6f41b3e93957fa60e35c5123d4749afc349ee418fbeb2b8919f6533197ab9caf