[INFO] cloning repository https://github.com/shaoxi2010/ulist
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shaoxi2010/ulist" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshaoxi2010%2Fulist", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshaoxi2010%2Fulist'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 09927df61989a7d6dd02dc6a100648d14a5868b2
[INFO] testing shaoxi2010/ulist against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshaoxi2010%2Fulist" "/workspace/builds/worker-20/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-20/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shaoxi2010/ulist on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shaoxi2010/ulist
[INFO] finished tweaking git repo https://github.com/shaoxi2010/ulist
[INFO] tweaked toml for git repo https://github.com/shaoxi2010/ulist written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] crate git repo https://github.com/shaoxi2010/ulist already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 979bfc81618a9c67dc928f902c9f2daeac03c147ff7f2f1b48dc8aa066759713
[INFO] running `Command { std: "docker" "start" "-a" "979bfc81618a9c67dc928f902c9f2daeac03c147ff7f2f1b48dc8aa066759713", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "979bfc81618a9c67dc928f902c9f2daeac03c147ff7f2f1b48dc8aa066759713", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "979bfc81618a9c67dc928f902c9f2daeac03c147ff7f2f1b48dc8aa066759713", kill_on_drop: false }`
[INFO] [stdout] 979bfc81618a9c67dc928f902c9f2daeac03c147ff7f2f1b48dc8aa066759713
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 70fdc59140373156f01ce8f29e4da1d4bcd637aaf8b48264ed5b523a12e28b80
[INFO] running `Command { std: "docker" "start" "-a" "70fdc59140373156f01ce8f29e4da1d4bcd637aaf8b48264ed5b523a12e28b80", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling ulist v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::UList`
[INFO] [stdout]    --> src/lib.rs:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     use crate::UList;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] help: consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]    --> src/lib.rs:142:1
[INFO] [stdout]     |
[INFO] [stdout] 142 | mod tests {
[INFO] [stdout]     | ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(linked_list_remove)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ulist` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "70fdc59140373156f01ce8f29e4da1d4bcd637aaf8b48264ed5b523a12e28b80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70fdc59140373156f01ce8f29e4da1d4bcd637aaf8b48264ed5b523a12e28b80", kill_on_drop: false }`
[INFO] [stdout] 70fdc59140373156f01ce8f29e4da1d4bcd637aaf8b48264ed5b523a12e28b80