[INFO] fetching crate mjb_gc 0.2.0...
[INFO] testing mjb_gc-0.2.0 against try#0abe69e6c16114311cc2700e972492e64d69c28f for pr-154065-1
[INFO] extracting crate mjb_gc 0.2.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate mjb_gc 0.2.0
[INFO] finished tweaking crates.io crate mjb_gc 0.2.0
[INFO] tweaked toml for crates.io crate mjb_gc 0.2.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mjb_gc 0.2.0 on toolchain 0abe69e6c16114311cc2700e972492e64d69c28f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 7 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cca38606b6aaef9cbe72c8118796e20c542dd6452790537e8cc9f8d80c00182b
[INFO] running `Command { std: "docker" "start" "-a" "cca38606b6aaef9cbe72c8118796e20c542dd6452790537e8cc9f8d80c00182b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cca38606b6aaef9cbe72c8118796e20c542dd6452790537e8cc9f8d80c00182b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cca38606b6aaef9cbe72c8118796e20c542dd6452790537e8cc9f8d80c00182b", kill_on_drop: false }`
[INFO] [stdout] cca38606b6aaef9cbe72c8118796e20c542dd6452790537e8cc9f8d80c00182b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7911d3021d52358eda83b5278edd2663c06b674ae013df60a1d77f40324f7ec2
[INFO] running `Command { std: "docker" "start" "-a" "7911d3021d52358eda83b5278edd2663c06b674ae013df60a1d77f40324f7ec2", kill_on_drop: false }`
[INFO] [stderr]    Compiling mjb_gc v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]    --> src/lib.rs:107:23
[INFO] [stdout]     |
[INFO] [stdout] 107 |               Box::leak(box GcInner {
[INFO] [stdout]     |  _______________________^
[INFO] [stdout] 108 | |                 ref_count: Cell::new(1),
[INFO] [stdout] 109 | |                 internal_ref_count: Cell::new(0),
[INFO] [stdout] 110 | |                 done: Cell::new(false),
[INFO] [stdout] 111 | |                 dropped: Cell::new(false),
[INFO] [stdout] 112 | |                 value: MaybeUninit::new(value),
[INFO] [stdout] 113 | |             })
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]     |
[INFO] [stdout] 107 ~             Box::leak(Box::new(GcInner {
[INFO] [stdout] 108 |                 ref_count: Cell::new(1),
[INFO] [stdout] ...
[INFO] [stdout] 112 |                 value: MaybeUninit::new(value),
[INFO] [stdout] 113 ~             }))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `box_syntax` has been removed
[INFO] [stdout]    --> src/lib.rs:160:23
[INFO] [stdout]     |
[INFO] [stdout] 160 |               Box::leak(box GcInner {
[INFO] [stdout]     |  _______________________^
[INFO] [stdout] 161 | |                 ref_count: Cell::new(1),
[INFO] [stdout] 162 | |                 internal_ref_count: Cell::new(0),
[INFO] [stdout] 163 | |                 done: Cell::new(false),
[INFO] [stdout] 164 | |                 dropped: Cell::new(true),
[INFO] [stdout] 165 | |                 value: MaybeUninit::<T>::uninit(),
[INFO] [stdout] 166 | |             })
[INFO] [stdout]     | |_____________^
[INFO] [stdout]     |
[INFO] [stdout] help: use `Box::new()` instead
[INFO] [stdout]     |
[INFO] [stdout] 160 ~             Box::leak(Box::new(GcInner {
[INFO] [stdout] 161 |                 ref_count: Cell::new(1),
[INFO] [stdout] ...
[INFO] [stdout] 165 |                 value: MaybeUninit::<T>::uninit(),
[INFO] [stdout] 166 ~             }))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(box_syntax)]
[INFO] [stdout]   |            ^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in 1.70.0; see <https://github.com/rust-lang/rust/pull/108471> for more information
[INFO] [stdout]   = note: replaced with `#[rustc_box]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `cell_update` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(cell_update)]
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `maybe_uninit_extra` has been stable since 1.60.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(maybe_uninit_extra)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mjb_gc` (lib) due to 3 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "7911d3021d52358eda83b5278edd2663c06b674ae013df60a1d77f40324f7ec2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7911d3021d52358eda83b5278edd2663c06b674ae013df60a1d77f40324f7ec2", kill_on_drop: false }`
[INFO] [stdout] 7911d3021d52358eda83b5278edd2663c06b674ae013df60a1d77f40324f7ec2
