[INFO] cloning repository https://github.com/genuinebnt/datastructures-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/genuinebnt/datastructures-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgenuinebnt%2Fdatastructures-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgenuinebnt%2Fdatastructures-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 86a8d5f8a37b9a2c649f2ca0b8e2202bb25dbe65
[INFO] testing genuinebnt/datastructures-rs against master#9e136a30a965bf4e63f03095c57df7257bf96fd6 for pr-134530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgenuinebnt%2Fdatastructures-rs" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/genuinebnt/datastructures-rs on toolchain 9e136a30a965bf4e63f03095c57df7257bf96fd6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9e136a30a965bf4e63f03095c57df7257bf96fd6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/genuinebnt/datastructures-rs
[INFO] finished tweaking git repo https://github.com/genuinebnt/datastructures-rs
[INFO] tweaked toml for git repo https://github.com/genuinebnt/datastructures-rs written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/genuinebnt/datastructures-rs 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" "+9e136a30a965bf4e63f03095c57df7257bf96fd6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "+9e136a30a965bf4e63f03095c57df7257bf96fd6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d0096901bd7d78d54f6caf2a2b00ea4fe22496261bee87e1af17f32f685aae9d
[INFO] running `Command { std: "docker" "start" "-a" "d0096901bd7d78d54f6caf2a2b00ea4fe22496261bee87e1af17f32f685aae9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d0096901bd7d78d54f6caf2a2b00ea4fe22496261bee87e1af17f32f685aae9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0096901bd7d78d54f6caf2a2b00ea4fe22496261bee87e1af17f32f685aae9d", kill_on_drop: false }`
[INFO] [stdout] d0096901bd7d78d54f6caf2a2b00ea4fe22496261bee87e1af17f32f685aae9d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "+9e136a30a965bf4e63f03095c57df7257bf96fd6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c181c0ce65d625b56738a14980a4c522c9082523065c119528db8bd247dbde97
[INFO] running `Command { std: "docker" "start" "-a" "c181c0ce65d625b56738a14980a4c522c9082523065c119528db8bd247dbde97", kill_on_drop: false }`
[INFO] [stderr]    Compiling datastructures-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `push_back` is never used
[INFO] [stdout]   --> src/lists/singly_linked_list.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl List {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn push_back(&mut self, elem: i32) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "c181c0ce65d625b56738a14980a4c522c9082523065c119528db8bd247dbde97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c181c0ce65d625b56738a14980a4c522c9082523065c119528db8bd247dbde97", kill_on_drop: false }`
[INFO] [stdout] c181c0ce65d625b56738a14980a4c522c9082523065c119528db8bd247dbde97
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "+9e136a30a965bf4e63f03095c57df7257bf96fd6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ff50bafdc4eef1edfcf8a2059143ff4a4f151c3526112b6eb338378dcbc5ace
[INFO] running `Command { std: "docker" "start" "-a" "6ff50bafdc4eef1edfcf8a2059143ff4a4f151c3526112b6eb338378dcbc5ace", kill_on_drop: false }`
[INFO] [stderr]    Compiling datastructures-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `push_back` is never used
[INFO] [stdout]   --> src/lists/singly_linked_list.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl List {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn push_back(&mut self, elem: i32) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `Command { std: "docker" "inspect" "6ff50bafdc4eef1edfcf8a2059143ff4a4f151c3526112b6eb338378dcbc5ace", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ff50bafdc4eef1edfcf8a2059143ff4a4f151c3526112b6eb338378dcbc5ace", kill_on_drop: false }`
[INFO] [stdout] 6ff50bafdc4eef1edfcf8a2059143ff4a4f151c3526112b6eb338378dcbc5ace
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "+9e136a30a965bf4e63f03095c57df7257bf96fd6" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 22fa74084cc38285497f2f03606905243a0896eb72ef8d3517977943f5fcf26c
[INFO] running `Command { std: "docker" "start" "-a" "22fa74084cc38285497f2f03606905243a0896eb72ef8d3517977943f5fcf26c", kill_on_drop: false }`
[INFO] [stderr] warning: method `push_back` is never used
[INFO] [stderr]   --> src/lists/singly_linked_list.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 21 | impl List {
[INFO] [stderr]    | --------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 26 |     pub fn push_back(&mut self, elem: i32) {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `datastructures-rs` (bin "datastructures-rs" test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/datastructures_rs-1de5dcd147e04db0)
[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" "22fa74084cc38285497f2f03606905243a0896eb72ef8d3517977943f5fcf26c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22fa74084cc38285497f2f03606905243a0896eb72ef8d3517977943f5fcf26c", kill_on_drop: false }`
[INFO] [stdout] 22fa74084cc38285497f2f03606905243a0896eb72ef8d3517977943f5fcf26c