[INFO] fetching crate lightbeam 0.19.0...
[INFO] documenting lightbeam-0.19.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate lightbeam 0.19.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate lightbeam 0.19.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lightbeam 0.19.0
[INFO] finished tweaking crates.io crate lightbeam 0.19.0
[INFO] tweaked toml for crates.io crate lightbeam 0.19.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate lightbeam 0.19.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", 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] 0091cab3c291732aab53a2a8b2fa7175f1ca56672d14ec6904eda733bc91d9a5
[INFO] running `Command { std: "docker" "start" "-a" "0091cab3c291732aab53a2a8b2fa7175f1ca56672d14ec6904eda733bc91d9a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0091cab3c291732aab53a2a8b2fa7175f1ca56672d14ec6904eda733bc91d9a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0091cab3c291732aab53a2a8b2fa7175f1ca56672d14ec6904eda733bc91d9a5", kill_on_drop: false }`
[INFO] [stdout] 0091cab3c291732aab53a2a8b2fa7175f1ca56672d14ec6904eda733bc91d9a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "RUSTDOCFLAGS=--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--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] e838774af6804867740e01afdfc6e16ce4fc4edd819ea3002e1feb61e96ee57b
[INFO] running `Command { std: "docker" "start" "-a" "e838774af6804867740e01afdfc6e16ce4fc4edd819ea3002e1feb61e96ee57b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling syn v1.0.34
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.66.0
[INFO] [stderr]    Compiling cranelift-entity v0.66.0
[INFO] [stderr]     Checking smallvec v1.4.1
[INFO] [stderr]     Checking more-asserts v0.2.1
[INFO] [stderr]     Checking wasmparser v0.59.0
[INFO] [stderr]     Checking staticvec v0.10.1
[INFO] [stderr]    Compiling capstone-sys v0.10.0
[INFO] [stderr]    Compiling memoffset v0.5.5
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking gimli v0.21.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/staticvec-0.10.1/src/lib.rs:30:1
[INFO] [stdout]    |
[INFO] [stdout] 30 | / #![feature(
[INFO] [stdout] 31 | |   const_fn,
[INFO] [stdout] 32 | |   const_fn_union,
[INFO] [stdout] 33 | |   const_generics,
[INFO] [stdout] ...  |
[INFO] [stdout] 52 | |   untagged_unions
[INFO] [stdout] 53 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/staticvec-0.10.1/src/lib.rs:54:30
[INFO] [stdout]    |
[INFO] [stdout] 54 | #![cfg_attr(feature = "std", feature(read_initializer))]
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking dynasmrt v0.5.2
[INFO] [stderr]     Checking regalloc v0.0.27
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `staticvec`.
[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" "e838774af6804867740e01afdfc6e16ce4fc4edd819ea3002e1feb61e96ee57b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e838774af6804867740e01afdfc6e16ce4fc4edd819ea3002e1feb61e96ee57b", kill_on_drop: false }`
[INFO] [stdout] e838774af6804867740e01afdfc6e16ce4fc4edd819ea3002e1feb61e96ee57b