[INFO] fetching crate audiograph 0.5.1...
[INFO] checking audiograph-0.5.1 against beta for pr-78714
[INFO] extracting crate audiograph 0.5.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate audiograph 0.5.1 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 audiograph 0.5.1
[INFO] finished tweaking crates.io crate audiograph 0.5.1
[INFO] tweaked toml for crates.io crate audiograph 0.5.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate audiograph 0.5.1 already has a lockfile, it will not be regenerated
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 5b90f4be430cb5bee83c98cbc0bae5c8c39cdee5ed1b556129af688b7d13f549
[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" "5b90f4be430cb5bee83c98cbc0bae5c8c39cdee5ed1b556129af688b7d13f549", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b90f4be430cb5bee83c98cbc0bae5c8c39cdee5ed1b556129af688b7d13f549", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b90f4be430cb5bee83c98cbc0bae5c8c39cdee5ed1b556129af688b7d13f549", kill_on_drop: false }`
[INFO] [stdout] 5b90f4be430cb5bee83c98cbc0bae5c8c39cdee5ed1b556129af688b7d13f549
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] c6f65a16a8b49a0c8f04658617c68e887a7151e32a98e2cfd38c43f77d713cc9
[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" "c6f65a16a8b49a0c8f04658617c68e887a7151e32a98e2cfd38c43f77d713cc9", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling libloading v0.4.3
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]     Checking fixedbitset v0.1.9
[INFO] [stderr]     Checking sample v0.6.2
[INFO] [stderr]     Checking bufferpool v0.1.7
[INFO] [stderr]     Checking sample v0.10.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking petgraph v0.2.10
[INFO] [stderr]     Checking jack-sys v0.2.0
[INFO] [stderr]     Checking jack v0.6.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking daggy v0.4.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]     Checking dsp-chain v0.13.1
[INFO] [stderr]     Checking generational-arena v0.2.7
[INFO] [stderr]     Checking audiograph v0.5.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling alloc_counter_macro v0.0.2
[INFO] [stderr]     Checking alloc_counter v0.0.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> benches/dsp-chain-alternative.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]  --> benches/dsp-chain-alternative.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::cell::RefCell;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> benches/dsp-chain-alternative.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `audiograph`
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[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" "c6f65a16a8b49a0c8f04658617c68e887a7151e32a98e2cfd38c43f77d713cc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6f65a16a8b49a0c8f04658617c68e887a7151e32a98e2cfd38c43f77d713cc9", kill_on_drop: false }`
[INFO] [stdout] c6f65a16a8b49a0c8f04658617c68e887a7151e32a98e2cfd38c43f77d713cc9