[INFO] fetching crate slabmalloc 0.8.0...
[INFO] checking slabmalloc-0.8.0 against try#3bb2879ea9e58d65b875f9a98df44f4a43ce2597 for pr-85387
[INFO] extracting crate slabmalloc 0.8.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate slabmalloc 0.8.0 on toolchain 3bb2879ea9e58d65b875f9a98df44f4a43ce2597
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slabmalloc 0.8.0
[INFO] finished tweaking crates.io crate slabmalloc 0.8.0
[INFO] tweaked toml for crates.io crate slabmalloc 0.8.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate slabmalloc 0.8.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dfbf02b12bebca841a2c2a98e84f88e35f37e42bdd6667658d225b5cc66d8f11
[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" "dfbf02b12bebca841a2c2a98e84f88e35f37e42bdd6667658d225b5cc66d8f11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dfbf02b12bebca841a2c2a98e84f88e35f37e42bdd6667658d225b5cc66d8f11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfbf02b12bebca841a2c2a98e84f88e35f37e42bdd6667658d225b5cc66d8f11", kill_on_drop: false }`
[INFO] [stdout] dfbf02b12bebca841a2c2a98e84f88e35f37e42bdd6667658d225b5cc66d8f11
[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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3bb2879ea9e58d65b875f9a98df44f4a43ce2597" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 96b79d3741672864b83ffe6d35ee5b05c8334d10ee04f0679a36e5c4231d570a
[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" "96b79d3741672864b83ffe6d35ee5b05c8334d10ee04f0679a36e5c4231d570a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking regex-syntax v0.6.23
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking slabmalloc v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/lib.rs:21:43
[INFO] [stdout]    |
[INFO] [stdout] 21 | #![cfg_attr(feature = "unstable", feature(const_fn, const_mut_refs))]
[INFO] [stdout]    |                                           ^^^^^^^^ feature has been removed
[INFO] [stdout]    |
[INFO] [stdout]    = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking aho-corasick v0.7.15
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `slabmalloc`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "96b79d3741672864b83ffe6d35ee5b05c8334d10ee04f0679a36e5c4231d570a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96b79d3741672864b83ffe6d35ee5b05c8334d10ee04f0679a36e5c4231d570a", kill_on_drop: false }`
[INFO] [stdout] 96b79d3741672864b83ffe6d35ee5b05c8334d10ee04f0679a36e5c4231d570a