[INFO] updating cached repository https://github.com/McGiver-/rust_practice
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c8a73d658f33fc5ce21503726c9815dba08bf932
[INFO] checking McGiver-/rust_practice against try#0ab79c4b48ad19260fa46623f452c1b403a360e8 for pr-74315
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcGiver-%2Frust_practice" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/McGiver-/rust_practice on toolchain 0ab79c4b48ad19260fa46623f452c1b403a360e8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/McGiver-/rust_practice
[INFO] finished tweaking git repo https://github.com/McGiver-/rust_practice
[INFO] tweaked toml for git repo https://github.com/McGiver-/rust_practice written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/McGiver-/rust_practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d3cc5331539fa9861b6481f6db2f15659b03922fb47f5fecef5158c1bedef70
[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" "3d3cc5331539fa9861b6481f6db2f15659b03922fb47f5fecef5158c1bedef70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d3cc5331539fa9861b6481f6db2f15659b03922fb47f5fecef5158c1bedef70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d3cc5331539fa9861b6481f6db2f15659b03922fb47f5fecef5158c1bedef70", kill_on_drop: false }`
[INFO] [stdout] 3d3cc5331539fa9861b6481f6db2f15659b03922fb47f5fecef5158c1bedef70
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 56650f0e183fd68da7b324bda58bec70a10e38ffda7c5d905320dbefad69899a
[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" "56650f0e183fd68da7b324bda58bec70a10e38ffda7c5d905320dbefad69899a", kill_on_drop: false }`
[INFO] [stderr]     Checking validate_palindrome v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/main.rs:31:28
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]   --> src/main.rs:31:36
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_map`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/main.rs:31:28
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `map`
[INFO] [stdout]   --> src/main.rs:31:36
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stdout]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_map`
[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 0.52s
[INFO] running `Command { std: "docker" "inspect" "56650f0e183fd68da7b324bda58bec70a10e38ffda7c5d905320dbefad69899a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56650f0e183fd68da7b324bda58bec70a10e38ffda7c5d905320dbefad69899a", kill_on_drop: false }`
[INFO] [stdout] 56650f0e183fd68da7b324bda58bec70a10e38ffda7c5d905320dbefad69899a