[INFO] cloning repository https://github.com/basalt79/rust_basic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/basalt79/rust_basic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbasalt79%2Frust_basic", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbasalt79%2Frust_basic'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1887ef24d2799a34696340fd9da7ab99309d382a
[INFO] checking basalt79/rust_basic against try#4a04890980766cc79878135f5ade8c0c4321e943 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbasalt79%2Frust_basic" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/basalt79/rust_basic on toolchain 4a04890980766cc79878135f5ade8c0c4321e943
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/basalt79/rust_basic
[INFO] finished tweaking git repo https://github.com/basalt79/rust_basic
[INFO] tweaked toml for git repo https://github.com/basalt79/rust_basic written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/basalt79/rust_basic already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1421bd6ca2e2d87fedb27b49dc22f0106c167393b0ca4ee5915c363bfc92532f
[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" "1421bd6ca2e2d87fedb27b49dc22f0106c167393b0ca4ee5915c363bfc92532f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1421bd6ca2e2d87fedb27b49dc22f0106c167393b0ca4ee5915c363bfc92532f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1421bd6ca2e2d87fedb27b49dc22f0106c167393b0ca4ee5915c363bfc92532f", kill_on_drop: false }`
[INFO] [stdout] 1421bd6ca2e2d87fedb27b49dc22f0106c167393b0ca4ee5915c363bfc92532f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+4a04890980766cc79878135f5ade8c0c4321e943" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f98d9c239fe05ef27bb964a551a22b96a1efc9e4507da2c5f917edd378c601bb
[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" "f98d9c239fe05ef27bb964a551a22b96a1efc9e4507da2c5f917edd378c601bb", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_basic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]  --> src/loops.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 |   let mut count = 0;
[INFO] [stdout]   |           ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arr2`
[INFO] [stdout]  --> src/pointer_ref.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let arr2 = arr1;
[INFO] [stdout]   |       ^^^^ help: if this is intentional, prefix it with an underscore: `_arr2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/loops.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 |   let mut count = 0;
[INFO] [stdout]   |       ----^^^^^
[INFO] [stdout]   |       |
[INFO] [stdout]   |       help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]  --> src/loops.rs:4:11
[INFO] [stdout]   |
[INFO] [stdout] 4 |   let mut count = 0;
[INFO] [stdout]   |           ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arr2`
[INFO] [stdout]  --> src/pointer_ref.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let arr2 = arr1;
[INFO] [stdout]   |       ^^^^ help: if this is intentional, prefix it with an underscore: `_arr2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/loops.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 |   let mut count = 0;
[INFO] [stdout]   |       ----^^^^^
[INFO] [stdout]   |       |
[INFO] [stdout]   |       help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.54s
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f98d9c239fe05ef27bb964a551a22b96a1efc9e4507da2c5f917edd378c601bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f98d9c239fe05ef27bb964a551a22b96a1efc9e4507da2c5f917edd378c601bb", kill_on_drop: false }`
[INFO] [stdout] f98d9c239fe05ef27bb964a551a22b96a1efc9e4507da2c5f917edd378c601bb