[INFO] fetching crate noria-server 0.6.0...
[INFO] testing noria-server-0.6.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate noria-server 0.6.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate noria-server 0.6.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate noria-server 0.6.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate noria-server 0.6.0
[INFO] tweaked toml for crates.io crate noria-server 0.6.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate noria-server 0.6.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "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-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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3ebbf5e8261150f5ecc0a773fe24d60c73458138120d7a7ff008f59ca11b23e2
[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" "3ebbf5e8261150f5ecc0a773fe24d60c73458138120d7a7ff008f59ca11b23e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3ebbf5e8261150f5ecc0a773fe24d60c73458138120d7a7ff008f59ca11b23e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ebbf5e8261150f5ecc0a773fe24d60c73458138120d7a7ff008f59ca11b23e2", kill_on_drop: false }`
[INFO] [stdout] 3ebbf5e8261150f5ecc0a773fe24d60c73458138120d7a7ff008f59ca11b23e2
[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" "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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f17755c13cfebfe090489ab994b83f76776c3a9ab6cc9410dd1f7311632cb475
[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" "f17755c13cfebfe090489ab994b83f76776c3a9ab6cc9410dd1f7311632cb475", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.71
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[INFO] [stderr]    Compiling cexpr v0.4.0
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]    Compiling pin-project-internal v0.4.19
[INFO] [stderr]    Compiling tokio-macros v0.2.5
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[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling zookeeper_derive v0.4.1
[INFO] [stderr]    Compiling zookeeper v0.5.9
[INFO] [stderr]    Compiling tokio v0.2.21
[INFO] [stderr]    Compiling time-macros v0.1.0
[INFO] [stderr]    Compiling tracing v0.1.15
[INFO] [stderr]    Compiling pin-project v0.4.19
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling tower-discover v0.3.0
[INFO] [stderr]    Compiling tracing-futures v0.2.4
[INFO] [stderr]    Compiling tower-load-shed v0.3.0
[INFO] [stderr]    Compiling tower-load v0.3.0
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling tower-buffer v0.3.0
[INFO] [stderr]    Compiling tower-retry v0.3.0
[INFO] [stderr]    Compiling tower-timeout v0.3.0
[INFO] [stderr]    Compiling async-timer v0.7.3
[INFO] [stderr]    Compiling tower-limit v0.3.1
[INFO] [stderr]    Compiling h2 v0.2.5
[INFO] [stderr]    Compiling tower-ready-cache v0.3.1
[INFO] [stderr]    Compiling tokio-tower v0.4.0
[INFO] [stderr]    Compiling stream-cancel v0.5.2
[INFO] [stderr]    Compiling tower-util v0.3.1
[INFO] [stderr]    Compiling streamunordered v0.5.1
[INFO] [stderr]    Compiling futures-executor v0.3.5
[INFO] [stderr]    Compiling tower-balance v0.3.0
[INFO] [stderr]    Compiling tower v0.3.1
[INFO] [stderr]    Compiling hyper v0.13.6
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling backtrace v0.3.48
[INFO] [stderr]    Compiling chrono v0.4.11
[INFO] [stderr]    Compiling bigdecimal v0.1.2
[INFO] [stderr]    Compiling serde_json v1.0.53
[INFO] [stderr]    Compiling rust_decimal v1.6.0
[INFO] [stderr]    Compiling bincode v1.2.1
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling nom-sql v0.0.11
[INFO] [stderr]    Compiling arccstr v1.3.0
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling async-bincode v0.5.1
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling assert_infrequent v0.1.0
[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/assert_infrequent-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `assert_infrequent`
[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" "f17755c13cfebfe090489ab994b83f76776c3a9ab6cc9410dd1f7311632cb475", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f17755c13cfebfe090489ab994b83f76776c3a9ab6cc9410dd1f7311632cb475", kill_on_drop: false }`
[INFO] [stdout] f17755c13cfebfe090489ab994b83f76776c3a9ab6cc9410dd1f7311632cb475