[INFO] cloning repository https://github.com/MSleepyPanda/explain-rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MSleepyPanda/explain-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMSleepyPanda%2Fexplain-rs"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMSleepyPanda%2Fexplain-rs'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 10522cf5c80910dfa6a0c1db49360ecef247cf89
[INFO] testing MSleepyPanda/explain-rs against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMSleepyPanda%2Fexplain-rs" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MSleepyPanda/explain-rs on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/MSleepyPanda/explain-rs
[INFO] finished tweaking git repo https://github.com/MSleepyPanda/explain-rs
[INFO] tweaked toml for git repo https://github.com/MSleepyPanda/explain-rs written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/MSleepyPanda/explain-rs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating git repository `https://github.com/shepmaster/fuzzy-pickles`
[INFO] [stderr]     Updating git repository `https://github.com/shepmaster/peresil`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded itertools v0.7.5
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4893e1f0a2b71070d0767e7590c697bf133bebb77a217a37e70070009f0a9213
[INFO] running `"docker" "start" "-a" "4893e1f0a2b71070d0767e7590c697bf133bebb77a217a37e70070009f0a9213"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling matches v0.1.6
[INFO] [stderr]    Compiling num-traits v0.1.41
[INFO] [stderr]    Compiling serde v1.0.24
[INFO] [stderr]    Compiling dtoa v0.4.2
[INFO] [stderr]    Compiling itoa v0.3.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.5
[INFO] [stderr]    Compiling either v1.4.0
[INFO] [stderr]    Compiling peresil v0.3.0 (https://github.com/shepmaster/peresil#6e4f794b)
[INFO] [stderr]    Compiling percent-encoding v1.0.1 (https://github.com/servo/rust-url#027450de)
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]    Compiling sha1 v0.3.0
[INFO] [stderr]    Compiling serde_derive_internals v0.18.0
[INFO] [stderr]    Compiling fuzzy-pickles-derive v0.1.0 (https://github.com/shepmaster/fuzzy-pickles#abf5ae5b)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/git/checkouts/peresil-7403d1c1394b7448/6e4f794/src/lib.rs:1:38
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(feature = "combinators", feature(conservative_impl_trait))]
[INFO] [stderr]   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling itertools v0.7.5
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `peresil`.
[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 `"docker" "inspect" "4893e1f0a2b71070d0767e7590c697bf133bebb77a217a37e70070009f0a9213"`
[INFO] running `"docker" "rm" "-f" "4893e1f0a2b71070d0767e7590c697bf133bebb77a217a37e70070009f0a9213"`
[INFO] [stdout] 4893e1f0a2b71070d0767e7590c697bf133bebb77a217a37e70070009f0a9213