[INFO] cloning repository https://github.com/titi31/palindrome
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/titi31/palindrome" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftiti31%2Fpalindrome", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftiti31%2Fpalindrome'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4227ed2e396471d0f938003084eedfb85815def2
[INFO] testing titi31/palindrome against try#d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2 for pr-86479
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftiti31%2Fpalindrome" "/workspace/builds/worker-109/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-109/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/titi31/palindrome on toolchain d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/titi31/palindrome
[INFO] finished tweaking git repo https://github.com/titi31/palindrome
[INFO] tweaked toml for git repo https://github.com/titi31/palindrome written to /workspace/builds/worker-109/source/Cargo.toml
[INFO] crate git repo https://github.com/titi31/palindrome already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] da0155a78d61fe42f142722cff8035bd177e6d3afb662ce2d605328226f28fd5
[INFO] running `Command { std: "docker" "start" "-a" "da0155a78d61fe42f142722cff8035bd177e6d3afb662ce2d605328226f28fd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "da0155a78d61fe42f142722cff8035bd177e6d3afb662ce2d605328226f28fd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da0155a78d61fe42f142722cff8035bd177e6d3afb662ce2d605328226f28fd5", kill_on_drop: false }`
[INFO] [stdout] da0155a78d61fe42f142722cff8035bd177e6d3afb662ce2d605328226f28fd5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d1e01e2e5b1427c3d563ace5b623454b4bdbf2ffc8c6ae27e99024af5cbff618
[INFO] running `Command { std: "docker" "start" "-a" "d1e01e2e5b1427c3d563ace5b623454b4bdbf2ffc8c6ae27e99024af5cbff618", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling palindrome v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut listtrie:LinkedList<u32>=LinkedList::new();
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.56s
[INFO] running `Command { std: "docker" "inspect" "d1e01e2e5b1427c3d563ace5b623454b4bdbf2ffc8c6ae27e99024af5cbff618", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1e01e2e5b1427c3d563ace5b623454b4bdbf2ffc8c6ae27e99024af5cbff618", kill_on_drop: false }`
[INFO] [stdout] d1e01e2e5b1427c3d563ace5b623454b4bdbf2ffc8c6ae27e99024af5cbff618
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9a5d06b2660078b7dc52494a92e0a4df9bc93035a5e962ba8f04a6fabe8768d9
[INFO] running `Command { std: "docker" "start" "-a" "9a5d06b2660078b7dc52494a92e0a4df9bc93035a5e962ba8f04a6fabe8768d9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling palindrome v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut listtrie:LinkedList<u32>=LinkedList::new();
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.12s
[INFO] running `Command { std: "docker" "inspect" "9a5d06b2660078b7dc52494a92e0a4df9bc93035a5e962ba8f04a6fabe8768d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a5d06b2660078b7dc52494a92e0a4df9bc93035a5e962ba8f04a6fabe8768d9", kill_on_drop: false }`
[INFO] [stdout] 9a5d06b2660078b7dc52494a92e0a4df9bc93035a5e962ba8f04a6fabe8768d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 38be3b75df1bb04c65a3f96746477a2ff2bd37afe40fe23ff4dc399c7a0697e8
[INFO] running `Command { std: "docker" "start" "-a" "38be3b75df1bb04c65a3f96746477a2ff2bd37afe40fe23ff4dc399c7a0697e8", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut listtrie:LinkedList<u32>=LinkedList::new();
[INFO] [stderr]   |         ----^^^^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `palindrome` (bin "palindrome" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/palindrome-07d76599cb32b31f)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "38be3b75df1bb04c65a3f96746477a2ff2bd37afe40fe23ff4dc399c7a0697e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38be3b75df1bb04c65a3f96746477a2ff2bd37afe40fe23ff4dc399c7a0697e8", kill_on_drop: false }`
[INFO] [stdout] 38be3b75df1bb04c65a3f96746477a2ff2bd37afe40fe23ff4dc399c7a0697e8