[INFO] cloning repository https://github.com/houhoulis/longest_sequential_subslice-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/houhoulis/longest_sequential_subslice-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhouhoulis%2Flongest_sequential_subslice-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhouhoulis%2Flongest_sequential_subslice-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 093159fa0c34bd9f831cda070625c9b9c0ebbbe8
[INFO] checking houhoulis/longest_sequential_subslice-rust against try#9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c for pr-79472
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhouhoulis%2Flongest_sequential_subslice-rust" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/houhoulis/longest_sequential_subslice-rust on toolchain 9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/houhoulis/longest_sequential_subslice-rust
[INFO] finished tweaking git repo https://github.com/houhoulis/longest_sequential_subslice-rust
[INFO] tweaked toml for git repo https://github.com/houhoulis/longest_sequential_subslice-rust written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/houhoulis/longest_sequential_subslice-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a51b18a66789c13c3ad63990b2d23e5253e3b6a1387453ef98293b1df2a0c87c
[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" "a51b18a66789c13c3ad63990b2d23e5253e3b6a1387453ef98293b1df2a0c87c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a51b18a66789c13c3ad63990b2d23e5253e3b6a1387453ef98293b1df2a0c87c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a51b18a66789c13c3ad63990b2d23e5253e3b6a1387453ef98293b1df2a0c87c", kill_on_drop: false }`
[INFO] [stdout] a51b18a66789c13c3ad63990b2d23e5253e3b6a1387453ef98293b1df2a0c87c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+9b49d8c6c904f63eb486fe51b14bbe0aa2feda4c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9f4db5cfa4080c9f4d1f113026a53ef60c876eed3fa19070da86d22295f0f38
[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" "f9f4db5cfa4080c9f4d1f113026a53ef60c876eed3fa19070da86d22295f0f38", kill_on_drop: false }`
[INFO] [stderr]     Checking longest_sequential_subslice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `current_end` is never read
[INFO] [stdout]   --> src/main.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |             current_end = current_start;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `main` has invalid return type `&[u8]`
[INFO] [stdout]  --> src/main.rs:1:22
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main(s: &[u8]) -> &[u8] {
[INFO] [stdout]   |                      ^^^^^ `main` can only return types that implement `Termination`
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider using `()`, or a `Result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0580]: `main` function has wrong type
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main(s: &[u8]) -> &[u8] {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
[INFO] [stdout]   |
[INFO] [stdout]   = note: expected fn pointer `for<'r> fn() -> &'r [u8]`
[INFO] [stdout]              found fn pointer `for<'r> fn(&'r [u8]) -> &'r [u8]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0580.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `longest_sequential_subslice`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "f9f4db5cfa4080c9f4d1f113026a53ef60c876eed3fa19070da86d22295f0f38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9f4db5cfa4080c9f4d1f113026a53ef60c876eed3fa19070da86d22295f0f38", kill_on_drop: false }`
[INFO] [stdout] f9f4db5cfa4080c9f4d1f113026a53ef60c876eed3fa19070da86d22295f0f38