[INFO] fetching crate nummap 0.5.1...
[INFO] testing nummap-0.5.1 against 1.44.0 for beta-1.45-1
[INFO] extracting crate nummap 0.5.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate nummap 0.5.1 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 nummap 0.5.1
[INFO] finished tweaking crates.io crate nummap 0.5.1
[INFO] tweaked toml for crates.io crate nummap 0.5.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-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" "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] 3aeda15058aa316714a6f2e66c8e2af63078959e89dc1274e646324eb37da7f4
[INFO] running `"docker" "start" "-a" "3aeda15058aa316714a6f2e66c8e2af63078959e89dc1274e646324eb37da7f4"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling const-random-macro v0.1.8
[INFO] [stderr]    Compiling const-random v0.1.8
[INFO] [stderr]    Compiling ahash v0.2.18
[INFO] [stderr]    Compiling hashbrown v0.6.3
[INFO] [stderr]    Compiling nummap v0.5.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | #![feature(associated_type_defaults,)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `nummap`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3aeda15058aa316714a6f2e66c8e2af63078959e89dc1274e646324eb37da7f4"`
[INFO] running `"docker" "rm" "-f" "3aeda15058aa316714a6f2e66c8e2af63078959e89dc1274e646324eb37da7f4"`
[INFO] [stdout] 3aeda15058aa316714a6f2e66c8e2af63078959e89dc1274e646324eb37da7f4