[INFO] fetching crate eko-gc 0.0.2...
[INFO] checking eko-gc-0.0.2 against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] extracting crate eko-gc 0.0.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate eko-gc 0.0.2 on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate eko-gc 0.0.2
[INFO] finished tweaking crates.io crate eko-gc 0.0.2
[INFO] tweaked toml for crates.io crate eko-gc 0.0.2 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bff46efa6c20fc80305069a172e5254559c37f89954ba7b29013ff5a47261ab8
[INFO] running `Command { std: "docker" "start" "-a" "bff46efa6c20fc80305069a172e5254559c37f89954ba7b29013ff5a47261ab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bff46efa6c20fc80305069a172e5254559c37f89954ba7b29013ff5a47261ab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bff46efa6c20fc80305069a172e5254559c37f89954ba7b29013ff5a47261ab8", kill_on_drop: false }`
[INFO] [stdout] bff46efa6c20fc80305069a172e5254559c37f89954ba7b29013ff5a47261ab8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d933a22b8666a356309f37739f712c5e96f824744e66f4126a37a19898d505a3
[INFO] running `Command { std: "docker" "start" "-a" "d933a22b8666a356309f37739f712c5e96f824744e66f4126a37a19898d505a3", kill_on_drop: false }`
[INFO] [stderr]     Checking eko-gc v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:42:47
[INFO] [stdout]    |
[INFO] [stdout] 42 |   pub(crate) boxes: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                               ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:74:28
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let gc_box: &GcBox<Trace> = unsafe { gc_box_ptr.as_ref() };
[INFO] [stdout]    |                            ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:82:38
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let mut unmarked: Vec<*mut GcBox<Trace>> = Vec::new();
[INFO] [stdout]    |                                      ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_box.rs:22:46
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub(crate) next: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                              ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:42:47
[INFO] [stdout]    |
[INFO] [stdout] 42 |   pub(crate) boxes: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                               ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:74:28
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let gc_box: &GcBox<Trace> = unsafe { gc_box_ptr.as_ref() };
[INFO] [stdout]    |                            ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_arena.rs:82:38
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let mut unmarked: Vec<*mut GcBox<Trace>> = Vec::new();
[INFO] [stdout]    |                                      ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/gc_box.rs:22:46
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub(crate) next: Option<NonNull<GcBox<'gc, Trace>>>,
[INFO] [stdout]    |                                              ^^^^^ help: use `dyn`: `dyn Trace`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `Command { std: "docker" "inspect" "d933a22b8666a356309f37739f712c5e96f824744e66f4126a37a19898d505a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d933a22b8666a356309f37739f712c5e96f824744e66f4126a37a19898d505a3", kill_on_drop: false }`
[INFO] [stdout] d933a22b8666a356309f37739f712c5e96f824744e66f4126a37a19898d505a3