[INFO] fetching crate staticvec 0.9.3...
[INFO] testing staticvec-0.9.3 against 1.44.0 for beta-1.45-1
[INFO] extracting crate staticvec 0.9.3 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate staticvec 0.9.3 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 staticvec 0.9.3
[INFO] removed 3 missing examples
[INFO] removed 3 missing tests
[INFO] finished tweaking crates.io crate staticvec 0.9.3
[INFO] tweaked toml for crates.io crate staticvec 0.9.3 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate staticvec 0.9.3 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] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] a8b024e55770de6685c802fcf77d8c673de309aef858688a7bde0a7ee726dda7
[INFO] running `"docker" "start" "-a" "a8b024e55770de6685c802fcf77d8c673de309aef858688a7bde0a7ee726dda7"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling staticvec v0.9.3 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | / #![feature(
[INFO] [stderr] 31 | |   const_compare_raw_pointers,
[INFO] [stderr] 32 | |   const_fn,
[INFO] [stderr] 33 | |   const_fn_union,
[INFO] [stderr] ...  |
[INFO] [stderr] 53 | |   untagged_unions
[INFO] [stderr] 54 | | )]
[INFO] [stderr]    | |__^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:55:30
[INFO] [stderr]    |
[INFO] [stderr] 55 | #![cfg_attr(feature = "std", feature(read_initializer))]
[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 `staticvec`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a8b024e55770de6685c802fcf77d8c673de309aef858688a7bde0a7ee726dda7"`
[INFO] running `"docker" "rm" "-f" "a8b024e55770de6685c802fcf77d8c673de309aef858688a7bde0a7ee726dda7"`
[INFO] [stdout] a8b024e55770de6685c802fcf77d8c673de309aef858688a7bde0a7ee726dda7