[INFO] crate pgc 0.3.0 is already in cache
[INFO] testing pgc-0.3.0 against 1.44.0 for beta-1.45-1
[INFO] extracting crate pgc 0.3.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate pgc 0.3.0 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate pgc 0.3.0
[INFO] finished tweaking crates.io crate pgc 0.3.0
[INFO] tweaked toml for crates.io crate pgc 0.3.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate pgc 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.44.0" "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] cfea49a74aa0d78cb96a144cc2be821cea40aeeaaefd83fde19eaa7b409e0322
[INFO] running `"docker" "start" "-a" "cfea49a74aa0d78cb96a144cc2be821cea40aeeaaefd83fde19eaa7b409e0322"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling cmake v0.1.42
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling threadpool v1.7.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling libmimalloc-sys v0.1.6
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling mimalloc v0.1.9
[INFO] [stderr]    Compiling pgc v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(coerce_unsized)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(unsize)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `pgc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "cfea49a74aa0d78cb96a144cc2be821cea40aeeaaefd83fde19eaa7b409e0322"`
[INFO] running `"docker" "rm" "-f" "cfea49a74aa0d78cb96a144cc2be821cea40aeeaaefd83fde19eaa7b409e0322"`
[INFO] [stdout] cfea49a74aa0d78cb96a144cc2be821cea40aeeaaefd83fde19eaa7b409e0322