[INFO] cloning repository https://github.com/Cerulity64X/two_mutable_refs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Cerulity64X/two_mutable_refs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulity64X%2Ftwo_mutable_refs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulity64X%2Ftwo_mutable_refs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d69ccd41fef2dd1ef0de18d32fed77d0a56d5a4a
[INFO] testing Cerulity64X/two_mutable_refs against 1.75.0 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulity64X%2Ftwo_mutable_refs" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Cerulity64X/two_mutable_refs on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Cerulity64X/two_mutable_refs
[INFO] finished tweaking git repo https://github.com/Cerulity64X/two_mutable_refs
[INFO] tweaked toml for git repo https://github.com/Cerulity64X/two_mutable_refs written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Cerulity64X/two_mutable_refs 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5a6a66ac5d2d68ea5541ed24fb32d96f0450d8c5c354530bc5a1cd4edacab42c
[INFO] running `Command { std: "docker" "start" "-a" "5a6a66ac5d2d68ea5541ed24fb32d96f0450d8c5c354530bc5a1cd4edacab42c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a6a66ac5d2d68ea5541ed24fb32d96f0450d8c5c354530bc5a1cd4edacab42c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a6a66ac5d2d68ea5541ed24fb32d96f0450d8c5c354530bc5a1cd4edacab42c", kill_on_drop: false }`
[INFO] [stdout] 5a6a66ac5d2d68ea5541ed24fb32d96f0450d8c5c354530bc5a1cd4edacab42c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 29f8fc798f5dec17bf594b4f63f0e54ce10ee05f38d210391e9c54cc17e09f9b
[INFO] running `Command { std: "docker" "start" "-a" "29f8fc798f5dec17bf594b4f63f0e54ce10ee05f38d210391e9c54cc17e09f9b", kill_on_drop: false }`
[INFO] [stderr]    Compiling two_mutable_refs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(get_mut_unchecked)]
[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 `two_mutable_refs` (bin "two_mutable_refs") due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "29f8fc798f5dec17bf594b4f63f0e54ce10ee05f38d210391e9c54cc17e09f9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29f8fc798f5dec17bf594b4f63f0e54ce10ee05f38d210391e9c54cc17e09f9b", kill_on_drop: false }`
[INFO] [stdout] 29f8fc798f5dec17bf594b4f63f0e54ce10ee05f38d210391e9c54cc17e09f9b
[INFO] testing Cerulity64X/two_mutable_refs against beta-2023-12-22 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCerulity64X%2Ftwo_mutable_refs" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Cerulity64X/two_mutable_refs on toolchain beta-2023-12-22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Cerulity64X/two_mutable_refs
[INFO] finished tweaking git repo https://github.com/Cerulity64X/two_mutable_refs
[INFO] tweaked toml for git repo https://github.com/Cerulity64X/two_mutable_refs written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Cerulity64X/two_mutable_refs 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" "+beta-2023-12-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6655a0cb64708b8a0d4c479bf95b1a88dd5b90da2b18649dfd4c4a022c1fd02e
[INFO] running `Command { std: "docker" "start" "-a" "6655a0cb64708b8a0d4c479bf95b1a88dd5b90da2b18649dfd4c4a022c1fd02e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6655a0cb64708b8a0d4c479bf95b1a88dd5b90da2b18649dfd4c4a022c1fd02e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6655a0cb64708b8a0d4c479bf95b1a88dd5b90da2b18649dfd4c4a022c1fd02e", kill_on_drop: false }`
[INFO] [stdout] 6655a0cb64708b8a0d4c479bf95b1a88dd5b90da2b18649dfd4c4a022c1fd02e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c90d7a9f323efc2f2d8fd257e5bb2c4665a33e3ce4b21c53068d404091dc2e8
[INFO] running `Command { std: "docker" "start" "-a" "3c90d7a9f323efc2f2d8fd257e5bb2c4665a33e3ce4b21c53068d404091dc2e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling two_mutable_refs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(get_mut_unchecked)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `two_mutable_refs` (bin "two_mutable_refs") due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "3c90d7a9f323efc2f2d8fd257e5bb2c4665a33e3ce4b21c53068d404091dc2e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c90d7a9f323efc2f2d8fd257e5bb2c4665a33e3ce4b21c53068d404091dc2e8", kill_on_drop: false }`
[INFO] [stdout] 3c90d7a9f323efc2f2d8fd257e5bb2c4665a33e3ce4b21c53068d404091dc2e8
