[INFO] fetching crate rust_icu_uenum 0.3.0...
[INFO] documenting rust_icu_uenum-0.3.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate rust_icu_uenum 0.3.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate rust_icu_uenum 0.3.0 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rust_icu_uenum 0.3.0
[INFO] finished tweaking crates.io crate rust_icu_uenum 0.3.0
[INFO] tweaked toml for crates.io crate rust_icu_uenum 0.3.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 359dbc83e07a525d203c80a7c07f9c0608112a42dfc867edbaafc0a15a7d1b44
[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" "359dbc83e07a525d203c80a7c07f9c0608112a42dfc867edbaafc0a15a7d1b44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "359dbc83e07a525d203c80a7c07f9c0608112a42dfc867edbaafc0a15a7d1b44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "359dbc83e07a525d203c80a7c07f9c0608112a42dfc867edbaafc0a15a7d1b44", kill_on_drop: false }`
[INFO] [stdout] 359dbc83e07a525d203c80a7c07f9c0608112a42dfc867edbaafc0a15a7d1b44
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+beta-2020-08-29" "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] 8130c7f2e7039e61dfa9b96ba4b8478ac892964c4958b71858cb5ff70aa9becf
[INFO] running `Command { std: "docker" "start" "-a" "8130c7f2e7039e61dfa9b96ba4b8478ac892964c4958b71858cb5ff70aa9becf", kill_on_drop: false }`
[INFO] [stderr]    Compiling bindgen v0.53.3
[INFO] [stderr]    Compiling paste v1.0.0
[INFO] [stderr]    Compiling clang-sys v0.29.3
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]    Compiling anyhow v1.0.32
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]    Compiling cexpr v0.4.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]    Compiling rust_icu_sys v0.3.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rust_icu_sys-0.3.1/build.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_icu_sys`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "8130c7f2e7039e61dfa9b96ba4b8478ac892964c4958b71858cb5ff70aa9becf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8130c7f2e7039e61dfa9b96ba4b8478ac892964c4958b71858cb5ff70aa9becf", kill_on_drop: false }`
[INFO] [stdout] 8130c7f2e7039e61dfa9b96ba4b8478ac892964c4958b71858cb5ff70aa9becf