[INFO] fetching crate pumpkindb_mio_server 0.2.0...
[INFO] checking pumpkindb_mio_server-0.2.0 against beta for pr-78714
[INFO] extracting crate pumpkindb_mio_server 0.2.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate pumpkindb_mio_server 0.2.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate pumpkindb_mio_server 0.2.0
[INFO] finished tweaking crates.io crate pumpkindb_mio_server 0.2.0
[INFO] tweaked toml for crates.io crate pumpkindb_mio_server 0.2.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e6885c8d6a3e389786a493130b75457f509361a4e388d47efccb76e037da2d4e
[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" "e6885c8d6a3e389786a493130b75457f509361a4e388d47efccb76e037da2d4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e6885c8d6a3e389786a493130b75457f509361a4e388d47efccb76e037da2d4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6885c8d6a3e389786a493130b75457f509361a4e388d47efccb76e037da2d4e", kill_on_drop: false }`
[INFO] [stdout] e6885c8d6a3e389786a493130b75457f509361a4e388d47efccb76e037da2d4e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7c5ca7378d817fbf5b328b2c0cd7365641d7b9822555c14ba8bda17456c69ea4
[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" "7c5ca7378d817fbf5b328b2c0cd7365641d7b9822555c14ba8bda17456c69ea4", kill_on_drop: false }`
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking hex-slice v0.1.4
[INFO] [stderr]     Checking log-mdc v0.1.0
[INFO] [stderr]     Checking toml v0.2.1
[INFO] [stderr]     Checking toml v0.3.2
[INFO] [stderr]    Compiling serde_codegen_internals v0.14.2
[INFO] [stderr]     Checking serde_bytes v0.10.5
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking miniz-sys v0.1.12
[INFO] [stderr]     Checking memmap v0.5.2
[INFO] [stderr]     Checking liblmdb-sys v0.2.2
[INFO] [stderr]     Checking ordered-float v0.4.0
[INFO] [stderr]     Checking uuid v0.4.0
[INFO] [stderr]     Checking chrono v0.3.0
[INFO] [stderr]     Checking snowflake v1.3.0
[INFO] [stderr]     Checking suppositions v0.1.4
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking lmdb-zero v0.4.4
[INFO] [stderr]     Checking serde-value v0.4.1
[INFO] [stderr]     Checking serde_cbor v0.6.1
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking config v0.3.1
[INFO] [stderr]     Checking hybrid-clocks v0.3.4
[INFO] [stderr]     Checking serde_yaml v0.6.2
[INFO] [stderr]    Compiling serde_derive v0.9.15
[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/config-0.3.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drop_types_in_const)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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/config-0.3.1/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(trace_macros)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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 `config`
[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" "7c5ca7378d817fbf5b328b2c0cd7365641d7b9822555c14ba8bda17456c69ea4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c5ca7378d817fbf5b328b2c0cd7365641d7b9822555c14ba8bda17456c69ea4", kill_on_drop: false }`
[INFO] [stdout] 7c5ca7378d817fbf5b328b2c0cd7365641d7b9822555c14ba8bda17456c69ea4