[INFO] fetching crate zerogc-simple 0.2.0-alpha.5...
[INFO] testing zerogc-simple-0.2.0-alpha.5 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] extracting crate zerogc-simple 0.2.0-alpha.5 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate zerogc-simple 0.2.0-alpha.5 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate zerogc-simple 0.2.0-alpha.5
[INFO] finished tweaking crates.io crate zerogc-simple 0.2.0-alpha.5
[INFO] tweaked toml for crates.io crate zerogc-simple 0.2.0-alpha.5 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] crate crates.io crate zerogc-simple 0.2.0-alpha.5 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 869f2baf00638a82a2fd0fcd8eae20308caf00254fc832bf71686db9d1348533
[INFO] running `Command { std: "docker" "start" "-a" "869f2baf00638a82a2fd0fcd8eae20308caf00254fc832bf71686db9d1348533", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "869f2baf00638a82a2fd0fcd8eae20308caf00254fc832bf71686db9d1348533", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "869f2baf00638a82a2fd0fcd8eae20308caf00254fc832bf71686db9d1348533", kill_on_drop: false }`
[INFO] [stdout] 869f2baf00638a82a2fd0fcd8eae20308caf00254fc832bf71686db9d1348533
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 976373a322231077e5cd6a11323d0633005d7a3865100b1f359f14d58db0d512
[INFO] running `Command { std: "docker" "start" "-a" "976373a322231077e5cd6a11323d0633005d7a3865100b1f359f14d58db0d512", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling instant v0.1.10
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling proc-macro-kwargs-derive v0.1.5
[INFO] [stderr]    Compiling proc-macro-kwargs v0.1.5
[INFO] [stderr]    Compiling zerogc-derive v0.2.0-alpha.5
[INFO] [stderr]    Compiling zerogc v0.2.0-alpha.5
[INFO] [stderr]    Compiling zerogc-context v0.2.0-alpha.5
[INFO] [stderr]    Compiling zerogc-simple v0.2.0-alpha.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: dereferencing raw mutable pointers in constant functions is unstable
[INFO] [stdout]   --> src/layout.rs:94:44
[INFO] [stdout]    |
[INFO] [stdout] 94 |         let align = std::mem::align_of_val(&*ptr);
[INFO] [stdout]    |                                            ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
[INFO] [stdout]    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `zerogc-simple` due to 2 previous errors
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "976373a322231077e5cd6a11323d0633005d7a3865100b1f359f14d58db0d512", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "976373a322231077e5cd6a11323d0633005d7a3865100b1f359f14d58db0d512", kill_on_drop: false }`
[INFO] [stdout] 976373a322231077e5cd6a11323d0633005d7a3865100b1f359f14d58db0d512