[INFO] fetching crate docker-puzzles 0.1.3...
[INFO] checking docker-puzzles-0.1.3 against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] extracting crate docker-puzzles 0.1.3 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate docker-puzzles 0.1.3 on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate docker-puzzles 0.1.3
[INFO] finished tweaking crates.io crate docker-puzzles 0.1.3
[INFO] tweaked toml for crates.io crate docker-puzzles 0.1.3 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 38b11469d8812628b388f83a88c63094b5ac1a724d3f108e62a3df7e6628502a
[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" "38b11469d8812628b388f83a88c63094b5ac1a724d3f108e62a3df7e6628502a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "38b11469d8812628b388f83a88c63094b5ac1a724d3f108e62a3df7e6628502a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38b11469d8812628b388f83a88c63094b5ac1a724d3f108e62a3df7e6628502a", kill_on_drop: false }`
[INFO] [stdout] 38b11469d8812628b388f83a88c63094b5ac1a724d3f108e62a3df7e6628502a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 67e3fc5180f2079fbb846f421acf5f566afedf0a493d74105e52aa2ee729242e
[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" "67e3fc5180f2079fbb846f421acf5f566afedf0a493d74105e52aa2ee729242e", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking docker-puzzles v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/error.rs:29:32
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn cause(&self) -> Option<&Error> {
[INFO] [stdout]    |                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[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/error.rs:29:32
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn cause(&self) -> Option<&Error> {
[INFO] [stdout]    |                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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 4.23s
[INFO] running `Command { std: "docker" "inspect" "67e3fc5180f2079fbb846f421acf5f566afedf0a493d74105e52aa2ee729242e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67e3fc5180f2079fbb846f421acf5f566afedf0a493d74105e52aa2ee729242e", kill_on_drop: false }`
[INFO] [stdout] 67e3fc5180f2079fbb846f421acf5f566afedf0a493d74105e52aa2ee729242e