[INFO] cloning repository https://github.com/juggernaut0/gc-sandbox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/juggernaut0/gc-sandbox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjuggernaut0%2Fgc-sandbox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjuggernaut0%2Fgc-sandbox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 47706c4a6461444573be21dc2ab0ae1e7cad0c1a
[INFO] testing juggernaut0/gc-sandbox against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjuggernaut0%2Fgc-sandbox" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/juggernaut0/gc-sandbox on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/juggernaut0/gc-sandbox
[INFO] finished tweaking git repo https://github.com/juggernaut0/gc-sandbox
[INFO] tweaked toml for git repo https://github.com/juggernaut0/gc-sandbox written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/juggernaut0/gc-sandbox already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 112997dc754ebf60d201056d4cafa5474fc0cf9ea0e5e8bf0fbbaeaefa495e74
[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" "112997dc754ebf60d201056d4cafa5474fc0cf9ea0e5e8bf0fbbaeaefa495e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "112997dc754ebf60d201056d4cafa5474fc0cf9ea0e5e8bf0fbbaeaefa495e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "112997dc754ebf60d201056d4cafa5474fc0cf9ea0e5e8bf0fbbaeaefa495e74", kill_on_drop: false }`
[INFO] [stdout] 112997dc754ebf60d201056d4cafa5474fc0cf9ea0e5e8bf0fbbaeaefa495e74
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fb0c5ae78236138d0091dea3d4c409e3d67f774f5e8ae503d41662f7fc5dc206
[INFO] running `Command { std: "docker" "start" "-a" "fb0c5ae78236138d0091dea3d4c409e3d67f774f5e8ae503d41662f7fc5dc206", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling gc_derive v0.1.0 (/opt/rustwide/workdir/gc_derive)
[INFO] [stderr]    Compiling gc v0.1.0 (/opt/rustwide/workdir/gc)
[INFO] [stderr]    Compiling gc_example v0.1.0 (/opt/rustwide/workdir/example)
[INFO] [stdout] warning: unused imports: `Cell`, `RefCell`
[INFO] [stdout]  --> example/src/main.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow data in a dereference of `gc::GcBor<'_, '_, SelfRef>` as mutable
[INFO] [stdout]   --> example/src/main.rs:38:6
[INFO] [stdout]    |
[INFO] [stdout] 38 |     *a.other = *Foo::gc_new(&ctx, Some(b));
[INFO] [stdout]    |      ^^^^^^^ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout]    = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `gc::GcBor<'_, '_, SelfRef>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0507]: cannot move out of dereference of `gc::GcBor<'_, '_, Foo>`
[INFO] [stdout]   --> example/src/main.rs:38:16
[INFO] [stdout]    |
[INFO] [stdout] 38 |     *a.other = *Foo::gc_new(&ctx, Some(b));
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^ move occurs because value has type `Foo`, which does not implement the `Copy` trait
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0507, E0596.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0507`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gc_example` due to 3 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "fb0c5ae78236138d0091dea3d4c409e3d67f774f5e8ae503d41662f7fc5dc206", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb0c5ae78236138d0091dea3d4c409e3d67f774f5e8ae503d41662f7fc5dc206", kill_on_drop: false }`
[INFO] [stdout] fb0c5ae78236138d0091dea3d4c409e3d67f774f5e8ae503d41662f7fc5dc206