[INFO] fetching crate pngeq 0.1.0...
[INFO] checking pngeq-0.1.0 against master#90442458ac46b1d5eed752c316da25450f67285b for pr-81477
[INFO] extracting crate pngeq 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate pngeq 0.1.0 on toolchain 90442458ac46b1d5eed752c316da25450f67285b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate pngeq 0.1.0
[INFO] finished tweaking crates.io crate pngeq 0.1.0
[INFO] tweaked toml for crates.io crate pngeq 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "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" "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" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f3fdfcfddce1e36a4dbaf7629d2b249d169dc2553f852e31aa115c0b2454b77f
[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" "f3fdfcfddce1e36a4dbaf7629d2b249d169dc2553f852e31aa115c0b2454b77f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3fdfcfddce1e36a4dbaf7629d2b249d169dc2553f852e31aa115c0b2454b77f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3fdfcfddce1e36a4dbaf7629d2b249d169dc2553f852e31aa115c0b2454b77f", kill_on_drop: false }`
[INFO] [stdout] f3fdfcfddce1e36a4dbaf7629d2b249d169dc2553f852e31aa115c0b2454b77f
[INFO] running `Command { std: "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" "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" "+90442458ac46b1d5eed752c316da25450f67285b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d5d0fac22a5481de1ebcb3e54baba2dc7fc69f2d3f9d06e8c1ca5464a50f9f24
[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" "d5d0fac22a5481de1ebcb3e54baba2dc7fc69f2d3f9d06e8c1ca5464a50f9f24", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking bytemuck v1.7.0
[INFO] [stderr]    Compiling lodepng v0.8.1
[INFO] [stderr]     Checking c_vec v1.0.12
[INFO] [stderr]     Checking exoquant v0.2.0
[INFO] [stderr]     Checking rgb v0.8.27
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking pngeq v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:38:23
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let ditherer: Box<ditherer::Ditherer> = match matches.value_of("ditherer")
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ditherer::Ditherer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:55:38
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let (optimizer, opt_level): (Box<Optimizer>, u32) = match matches.value_of("optimization level")
[INFO] [stdout]    |                                      ^^^^^^^^^ help: use `dyn`: `dyn Optimizer`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:38:23
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let ditherer: Box<ditherer::Ditherer> = match matches.value_of("ditherer")
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ditherer::Ditherer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:55:38
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let (optimizer, opt_level): (Box<Optimizer>, u32) = match matches.value_of("optimization level")
[INFO] [stdout]    |                                      ^^^^^^^^^ help: use `dyn`: `dyn Optimizer`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.19s
[INFO] running `Command { std: "docker" "inspect" "d5d0fac22a5481de1ebcb3e54baba2dc7fc69f2d3f9d06e8c1ca5464a50f9f24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5d0fac22a5481de1ebcb3e54baba2dc7fc69f2d3f9d06e8c1ca5464a50f9f24", kill_on_drop: false }`
[INFO] [stdout] d5d0fac22a5481de1ebcb3e54baba2dc7fc69f2d3f9d06e8c1ca5464a50f9f24