[INFO] cloning repository https://github.com/striggldy/mpmp4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/striggldy/mpmp4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstriggldy%2Fmpmp4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstriggldy%2Fmpmp4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 48b69f01dec7beb4496e93a864990334ad7f58e2
[INFO] testing striggldy/mpmp4 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%2Fstriggldy%2Fmpmp4" "/workspace/builds/worker-69/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-69/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/striggldy/mpmp4 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/striggldy/mpmp4
[INFO] finished tweaking git repo https://github.com/striggldy/mpmp4
[INFO] tweaked toml for git repo https://github.com/striggldy/mpmp4 written to /workspace/builds/worker-69/source/Cargo.toml
[INFO] crate git repo https://github.com/striggldy/mpmp4 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-69/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-69/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] 2187d2df3a8c1b8caf13ea6e6737c2505b9163826b3f45d3ce574c3edc98c87c
[INFO] running `Command { std: "docker" "start" "-a" "2187d2df3a8c1b8caf13ea6e6737c2505b9163826b3f45d3ce574c3edc98c87c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2187d2df3a8c1b8caf13ea6e6737c2505b9163826b3f45d3ce574c3edc98c87c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2187d2df3a8c1b8caf13ea6e6737c2505b9163826b3f45d3ce574c3edc98c87c", kill_on_drop: false }`
[INFO] [stdout] 2187d2df3a8c1b8caf13ea6e6737c2505b9163826b3f45d3ce574c3edc98c87c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-69/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-69/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] cb29ee83ad3d400ae178f0cf381d19c10f0f811333fa7549487fdebcfc078cea
[INFO] running `Command { std: "docker" "start" "-a" "cb29ee83ad3d400ae178f0cf381d19c10f0f811333fa7549487fdebcfc078cea", kill_on_drop: false }`
[INFO] [stderr]    Compiling mpmp4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_remove_item)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `vec_remove_item`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_remove_item)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `remove_item` found for struct `Vec<usize>` in the current scope
[INFO] [stdout]   --> src/main.rs:46:30
[INFO] [stdout]    |
[INFO] [stdout] 46 |                 next_choices.remove_item(choice);
[INFO] [stdout]    |                              ^^^^^^^^^^^ method not found in `Vec<usize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mpmp4` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "cb29ee83ad3d400ae178f0cf381d19c10f0f811333fa7549487fdebcfc078cea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb29ee83ad3d400ae178f0cf381d19c10f0f811333fa7549487fdebcfc078cea", kill_on_drop: false }`
[INFO] [stdout] cb29ee83ad3d400ae178f0cf381d19c10f0f811333fa7549487fdebcfc078cea