[INFO] cloning repository https://github.com/jojohanhannesnes/thousand_island
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jojohanhannesnes/thousand_island" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjojohanhannesnes%2Fthousand_island", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjojohanhannesnes%2Fthousand_island'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b7cb0b3e976eb04137e854f6ec1cb568565cf5a8
[INFO] building jojohanhannesnes/thousand_island against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjojohanhannesnes%2Fthousand_island" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jojohanhannesnes/thousand_island on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jojohanhannesnes/thousand_island
[INFO] finished tweaking git repo https://github.com/jojohanhannesnes/thousand_island
[INFO] tweaked toml for git repo https://github.com/jojohanhannesnes/thousand_island written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/jojohanhannesnes/thousand_island 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9be4bb7e82b316106fe9231d88a570ae42bcbaca62aee737163cc0d6845dc03
[INFO] running `Command { std: "docker" "start" "-a" "a9be4bb7e82b316106fe9231d88a570ae42bcbaca62aee737163cc0d6845dc03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9be4bb7e82b316106fe9231d88a570ae42bcbaca62aee737163cc0d6845dc03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9be4bb7e82b316106fe9231d88a570ae42bcbaca62aee737163cc0d6845dc03", kill_on_drop: false }`
[INFO] [stdout] a9be4bb7e82b316106fe9231d88a570ae42bcbaca62aee737163cc0d6845dc03
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail-expr-drop-order" "-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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ea879810e6f8964de387b622621dcdce25843e1c4547159c91eaa37d4e84c3d
[INFO] running `Command { std: "docker" "start" "-a" "3ea879810e6f8964de387b622621dcdce25843e1c4547159c91eaa37d4e84c3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling powerfmt v0.2.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling time-core v0.1.2
[INFO] [stderr]    Compiling num-conv v0.1.0
[INFO] [stderr]    Compiling algorithms v0.1.0 (/opt/rustwide/workdir/algorithms)
[INFO] [stdout] warning: struct `Edge` is never constructed
[INFO] [stdout]  --> algorithms/src/boruvkas.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Edge {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Graph` is never constructed
[INFO] [stdout]   --> algorithms/src/boruvkas.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Graph {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `boruvkas_algorithm` is never used
[INFO] [stdout]   --> algorithms/src/boruvkas.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn boruvkas_algorithm(graph: &Graph) -> Vec<Edge> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling deranged v0.3.11
[INFO] [stderr]    Compiling time v0.3.34
[INFO] [stderr]    Compiling getrandom v0.2.14
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling challenges v0.1.0 (/opt/rustwide/workdir/challenges)
[INFO] [stdout] warning: unexpected `cfg` condition value: `grapheme`
[INFO] [stdout]   --> challenges/src/exercism/reverse_string.rs:55:7
[INFO] [stdout]    |
[INFO] [stdout] 55 | #[cfg(feature = "grapheme")]
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = help: consider adding `grapheme` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `CONTENTS` is never used
[INFO] [stdout]  --> challenges/src/euler/largest_product_in_grid.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | const CONTENTS: &str = "
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_product_in_grid` is never used
[INFO] [stdout]   --> challenges/src/euler/largest_product_in_grid.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn largest_product_in_grid() -> u64 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.41s
[INFO] running `Command { std: "docker" "inspect" "3ea879810e6f8964de387b622621dcdce25843e1c4547159c91eaa37d4e84c3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ea879810e6f8964de387b622621dcdce25843e1c4547159c91eaa37d4e84c3d", kill_on_drop: false }`
[INFO] [stdout] 3ea879810e6f8964de387b622621dcdce25843e1c4547159c91eaa37d4e84c3d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail-expr-drop-order" "-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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c5cfd4eb06ca4f0593283ebb49646e2acf82c58a94a2361b19459d03884e750
[INFO] running `Command { std: "docker" "start" "-a" "3c5cfd4eb06ca4f0593283ebb49646e2acf82c58a94a2361b19459d03884e750", kill_on_drop: false }`
[INFO] [stderr]    Compiling algorithms v0.1.0 (/opt/rustwide/workdir/algorithms)
[INFO] [stdout] warning: struct `Edge` is never constructed
[INFO] [stdout]  --> algorithms/src/boruvkas.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Edge {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Graph` is never constructed
[INFO] [stdout]   --> algorithms/src/boruvkas.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Graph {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `boruvkas_algorithm` is never used
[INFO] [stdout]   --> algorithms/src/boruvkas.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn boruvkas_algorithm(graph: &Graph) -> Vec<Edge> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `grapheme`
[INFO] [stdout]   --> challenges/src/exercism/reverse_string.rs:55:7
[INFO] [stdout]    |
[INFO] [stdout] 55 | #[cfg(feature = "grapheme")]
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = help: consider adding `grapheme` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling challenges v0.1.0 (/opt/rustwide/workdir/challenges)
[INFO] [stdout] warning: constant `CONTENTS` is never used
[INFO] [stdout]  --> challenges/src/euler/largest_product_in_grid.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | const CONTENTS: &str = "
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_product_in_grid` is never used
[INFO] [stdout]   --> challenges/src/euler/largest_product_in_grid.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn largest_product_in_grid() -> u64 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `grapheme`
[INFO] [stdout]   --> challenges/src/exercism/reverse_string.rs:55:7
[INFO] [stdout]    |
[INFO] [stdout] 55 | #[cfg(feature = "grapheme")]
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^ help: remove the condition
[INFO] [stdout]    |
[INFO] [stdout]    = note: no expected values for `feature`
[INFO] [stdout]    = help: consider adding `grapheme` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Edge` is never constructed
[INFO] [stdout]  --> algorithms/src/boruvkas.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Edge {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Graph` is never constructed
[INFO] [stdout]   --> algorithms/src/boruvkas.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Graph {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `boruvkas_algorithm` is never used
[INFO] [stdout]   --> algorithms/src/boruvkas.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn boruvkas_algorithm(graph: &Graph) -> Vec<Edge> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 2.62s
[INFO] running `Command { std: "docker" "inspect" "3c5cfd4eb06ca4f0593283ebb49646e2acf82c58a94a2361b19459d03884e750", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c5cfd4eb06ca4f0593283ebb49646e2acf82c58a94a2361b19459d03884e750", kill_on_drop: false }`
[INFO] [stdout] 3c5cfd4eb06ca4f0593283ebb49646e2acf82c58a94a2361b19459d03884e750