[INFO] fetching crate gc-sequence 0.2.2...
[INFO] checking gc-sequence-0.2.2 against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] extracting crate gc-sequence 0.2.2 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate gc-sequence 0.2.2 on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate gc-sequence 0.2.2
[INFO] finished tweaking crates.io crate gc-sequence 0.2.2
[INFO] tweaked toml for crates.io crate gc-sequence 0.2.2 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded gc-arena v0.2.2
[INFO] [stderr]   Downloaded gc-arena-derive v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ea8c9c2d9dbabd0d8fc58fe0188a584b8945d87acb736188c657a486b647a787
[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" "ea8c9c2d9dbabd0d8fc58fe0188a584b8945d87acb736188c657a486b647a787", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea8c9c2d9dbabd0d8fc58fe0188a584b8945d87acb736188c657a486b647a787", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea8c9c2d9dbabd0d8fc58fe0188a584b8945d87acb736188c657a486b647a787", kill_on_drop: false }`
[INFO] [stdout] ea8c9c2d9dbabd0d8fc58fe0188a584b8945d87acb736188c657a486b647a787
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c75ee72a4074370cccf45e179711ac462edb2b5cda322257b4ab69f07ea4c1d
[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" "4c75ee72a4074370cccf45e179711ac462edb2b5cda322257b4ab69f07ea4c1d", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling gc-arena-derive v0.2.2
[INFO] [stderr]     Checking gc-arena v0.2.2
[INFO] [stderr]     Checking gc-sequence v0.2.2 (/tmp/fixit)
[INFO] [stderr]    Migrating src/lib.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating tests/tests.rs from 2018 edition to 2021
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 17.99s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking gc-sequence v0.2.2 (/tmp/fixit)
[INFO] [stdout] error[E0782]: trait objects must include the `dyn` keyword
[INFO] [stdout]   --> tests/tests.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | make_sequencable_arena!(test_sequencer, TestRoot);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `make_sequencable_arena` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: add `dyn` keyword before this trait
[INFO] [stdout]    |
[INFO] [stdout] 134|                             Some(f(&root.root).map(|r| -> Box<dyn Any> { Box::new(r) }).boxed());
[INFO] [stdout]    |                                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0782`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gc-sequence` due to 2 previous errors
[INFO] [stderr] error: failed to check after updating to 2021
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `cargo check --frozen --all --all-targets --message-format=json` (exit status: 101)
[INFO] running `Command { std: "docker" "inspect" "4c75ee72a4074370cccf45e179711ac462edb2b5cda322257b4ab69f07ea4c1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c75ee72a4074370cccf45e179711ac462edb2b5cda322257b4ab69f07ea4c1d", kill_on_drop: false }`
[INFO] [stdout] 4c75ee72a4074370cccf45e179711ac462edb2b5cda322257b4ab69f07ea4c1d