[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] checking juggernaut0/gc-sandbox against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjuggernaut0%2Fgc-sandbox" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/juggernaut0/gc-sandbox on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "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-14/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", 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] ad4d1a4e768c6706c4f48115b41a0f668f0df73a4422e96cbc67e7cdda343e8f
[INFO] running `Command { std: "docker" "start" "-a" "ad4d1a4e768c6706c4f48115b41a0f668f0df73a4422e96cbc67e7cdda343e8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad4d1a4e768c6706c4f48115b41a0f668f0df73a4422e96cbc67e7cdda343e8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad4d1a4e768c6706c4f48115b41a0f668f0df73a4422e96cbc67e7cdda343e8f", kill_on_drop: false }`
[INFO] [stdout] ad4d1a4e768c6706c4f48115b41a0f668f0df73a4422e96cbc67e7cdda343e8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=forbid" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b069576c8259e2a1ee949527229d459c2e61e3586502ee171cfbeca419eb9cb
[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" "8b069576c8259e2a1ee949527229d459c2e61e3586502ee171cfbeca419eb9cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking quote v1.0.9
[INFO] [stderr]     Checking syn v1.0.73
[INFO] [stderr]     Checking gc_derive v0.1.0 (/opt/rustwide/workdir/gc_derive)
[INFO] [stderr]     Checking gc v0.1.0 (/opt/rustwide/workdir/gc)
[INFO] [stderr]     Checking 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] 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] [stderr] warning: build failed, waiting for other jobs to finish...
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "8b069576c8259e2a1ee949527229d459c2e61e3586502ee171cfbeca419eb9cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b069576c8259e2a1ee949527229d459c2e61e3586502ee171cfbeca419eb9cb", kill_on_drop: false }`
[INFO] [stdout] 8b069576c8259e2a1ee949527229d459c2e61e3586502ee171cfbeca419eb9cb