[INFO] cloning repository https://github.com/wulymammoth/rust-dsa
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wulymammoth/rust-dsa" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwulymammoth%2Frust-dsa", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwulymammoth%2Frust-dsa'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 18dc14395e5425565561f35f818a7520132947b8
[INFO] checking wulymammoth/rust-dsa against try#9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869 for pr-129249
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwulymammoth%2Frust-dsa" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wulymammoth/rust-dsa on toolchain 9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wulymammoth/rust-dsa
[INFO] finished tweaking git repo https://github.com/wulymammoth/rust-dsa
[INFO] tweaked toml for git repo https://github.com/wulymammoth/rust-dsa written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/wulymammoth/rust-dsa already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a93267b45c73ea04c959d76abc01f19780bc19f98527d0104dd704eacefd0bdd
[INFO] running `Command { std: "docker" "start" "-a" "a93267b45c73ea04c959d76abc01f19780bc19f98527d0104dd704eacefd0bdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a93267b45c73ea04c959d76abc01f19780bc19f98527d0104dd704eacefd0bdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a93267b45c73ea04c959d76abc01f19780bc19f98527d0104dd704eacefd0bdd", kill_on_drop: false }`
[INFO] [stdout] a93267b45c73ea04c959d76abc01f19780bc19f98527d0104dd704eacefd0bdd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61767e98821576a5f0f4b2df5a34848dbfc28cef30b0ff14e7ece542b31ca371
[INFO] running `Command { std: "docker" "start" "-a" "61767e98821576a5f0f4b2df5a34848dbfc28cef30b0ff14e7ece542b31ca371", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-dsa v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]  --> src/data_structures/singly_linked_list.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct SinglyLinkedList<'a> {
[INFO] [stdout]   |            ---------------- field in this struct
[INFO] [stdout] 2 |     pub head: Option<&'a Node<'a>>,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/data_structures/queue.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         &self.data.push_back(item);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let _ = &self.data.push_back(item);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/data_structures/queue.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         &self.data.push_back(item);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let _ = &self.data.push_back(item);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "61767e98821576a5f0f4b2df5a34848dbfc28cef30b0ff14e7ece542b31ca371", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61767e98821576a5f0f4b2df5a34848dbfc28cef30b0ff14e7ece542b31ca371", kill_on_drop: false }`
[INFO] [stdout] 61767e98821576a5f0f4b2df5a34848dbfc28cef30b0ff14e7ece542b31ca371