[INFO] cloning repository https://github.com/UsairimIsani/rust-algo-prac
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/UsairimIsani/rust-algo-prac" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUsairimIsani%2Frust-algo-prac", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUsairimIsani%2Frust-algo-prac'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b6c0cd29231896c9ba2e7ab59ca793c593c0cebc
[INFO] testing UsairimIsani/rust-algo-prac against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUsairimIsani%2Frust-algo-prac" "/workspace/builds/worker-113/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-113/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/UsairimIsani/rust-algo-prac on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-113/source/.cargo/config
[INFO] started tweaking git repo https://github.com/UsairimIsani/rust-algo-prac
[INFO] finished tweaking git repo https://github.com/UsairimIsani/rust-algo-prac
[INFO] tweaked toml for git repo https://github.com/UsairimIsani/rust-algo-prac written to /workspace/builds/worker-113/source/Cargo.toml
[INFO] crate git repo https://github.com/UsairimIsani/rust-algo-prac already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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-113/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e298dd15478d2d5a2be700734046277d8ba9bd4fca724e651e3d3243ecf2b962
[INFO] running `Command { std: "docker" "start" "-a" "e298dd15478d2d5a2be700734046277d8ba9bd4fca724e651e3d3243ecf2b962", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e298dd15478d2d5a2be700734046277d8ba9bd4fca724e651e3d3243ecf2b962", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e298dd15478d2d5a2be700734046277d8ba9bd4fca724e651e3d3243ecf2b962", kill_on_drop: false }`
[INFO] [stdout] e298dd15478d2d5a2be700734046277d8ba9bd4fca724e651e3d3243ecf2b962
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-113/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91a99da1fe8b343c8bf9de3cd8f81f444df60f6869568f53fec6e34bf2bafd22
[INFO] running `Command { std: "docker" "start" "-a" "91a99da1fe8b343c8bf9de3cd8f81f444df60f6869568f53fec6e34bf2bafd22", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling trees v0.1.0 (/opt/rustwide/workdir/trees)
[INFO] [stderr]    Compiling s_q v0.1.0 (/opt/rustwide/workdir/s_q)
[INFO] [stderr]    Compiling sorting v0.1.0 (/opt/rustwide/workdir/sorting)
[INFO] [stderr]    Compiling recursion v0.1.0 (/opt/rustwide/workdir/recursion)
[INFO] [stderr]    Compiling lists v0.1.0 (/opt/rustwide/workdir/lists)
[INFO] [stdout] warning: function is never used: `hello`
[INFO] [stdout]  --> s_q/src/stack/mod.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn hello(){
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> recursion/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `recursion` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> trees/src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     name:String
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "91a99da1fe8b343c8bf9de3cd8f81f444df60f6869568f53fec6e34bf2bafd22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91a99da1fe8b343c8bf9de3cd8f81f444df60f6869568f53fec6e34bf2bafd22", kill_on_drop: false }`
[INFO] [stdout] 91a99da1fe8b343c8bf9de3cd8f81f444df60f6869568f53fec6e34bf2bafd22