[INFO] fetching crate rkdb 0.4.0...
[INFO] testing rkdb-0.4.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate rkdb 0.4.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate rkdb 0.4.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rkdb 0.4.0
[INFO] finished tweaking crates.io crate rkdb 0.4.0
[INFO] tweaked toml for crates.io crate rkdb 0.4.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7a80faf62dab69aab31fced7b46ffb8b86a8f2c3c2d11484415788fe0556bba4
[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" "7a80faf62dab69aab31fced7b46ffb8b86a8f2c3c2d11484415788fe0556bba4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a80faf62dab69aab31fced7b46ffb8b86a8f2c3c2d11484415788fe0556bba4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a80faf62dab69aab31fced7b46ffb8b86a8f2c3c2d11484415788fe0556bba4", kill_on_drop: false }`
[INFO] [stdout] 7a80faf62dab69aab31fced7b46ffb8b86a8f2c3c2d11484415788fe0556bba4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 96a9c4d30bf963603aa13599d7845a5ad35eef4e1838f6dbac361ac84a26050e
[INFO] running `Command { std: "docker" "start" "-a" "96a9c4d30bf963603aa13599d7845a5ad35eef4e1838f6dbac361ac84a26050e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling nix v0.11.1
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling num v0.2.1
[INFO] [stderr]    Compiling rkdb v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(lang_items, box_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `types::*`
[INFO] [stdout]  --> src/kapi.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use types::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]    --> src/kbindings.rs:256:20
[INFO] [stdout]     |
[INFO] [stdout] 256 |     unsafe { &*kb( { if b { 1 } else { 0 } } ) }
[INFO] [stdout]     |                    ^^                     ^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout] 256 -     unsafe { &*kb( { if b { 1 } else { 0 } } ) }
[INFO] [stdout] 256 +     unsafe { &*kb( if b { 1 } else { 0 } ) }
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rkdb` due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "96a9c4d30bf963603aa13599d7845a5ad35eef4e1838f6dbac361ac84a26050e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96a9c4d30bf963603aa13599d7845a5ad35eef4e1838f6dbac361ac84a26050e", kill_on_drop: false }`
[INFO] [stdout] 96a9c4d30bf963603aa13599d7845a5ad35eef4e1838f6dbac361ac84a26050e