[INFO] crate fnconcat 0.2.3 is already in cache
[INFO] testing fnconcat-0.2.3 against 1.44.0 for beta-1.45-1
[INFO] extracting crate fnconcat 0.2.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate fnconcat 0.2.3 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 fnconcat 0.2.3
[INFO] finished tweaking crates.io crate fnconcat 0.2.3
[INFO] tweaked toml for crates.io crate fnconcat 0.2.3 written to /workspace/builds/worker-4/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-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" "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] 7e5311e04007aeb339b5220efc7e4f0c9a7c187c7dc07fe44d8ea3de4a1ad1a5
[INFO] running `"docker" "start" "-a" "7e5311e04007aeb339b5220efc7e4f0c9a7c187c7dc07fe44d8ea3de4a1ad1a5"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling fnconcat v0.2.3 (/opt/rustwide/workdir)
[INFO] [stderr] error: expected one of `,`, `@`, `]`, or `|`, found `..`
[INFO] [stderr]    --> src/lib.rs:102:23
[INFO] [stderr]     |
[INFO] [stderr] 102 |               ref rest..] if delim.delim == token::DelimToken::Bracket => {
[INFO] [stderr]     |                       -^
[INFO] [stderr]     |                       |
[INFO] [stderr]     |                       expected one of `,`, `@`, `]`, or `|`
[INFO] [stderr]     |                       help: missing `,`
[INFO] [stderr] 
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]  --> src/lib.rs:6:61
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(plugin_registrar, rustc_private, slice_patterns, advanced_slice_patterns)]
[INFO] [stderr]   |                                                             ^^^^^^^^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stderr]   |
[INFO] [stderr]   = note: merged into `#![feature(slice_patterns)]`
[INFO] [stderr] 
[INFO] [stderr] error[E0463]: can't find crate for `rustc_plugin`
[INFO] [stderr]  --> src/lib.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | extern crate rustc_plugin;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0463, E0557.
[INFO] [stderr] For more information about an error, try `rustc --explain E0463`.
[INFO] [stderr] error: could not compile `fnconcat`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7e5311e04007aeb339b5220efc7e4f0c9a7c187c7dc07fe44d8ea3de4a1ad1a5"`
[INFO] running `"docker" "rm" "-f" "7e5311e04007aeb339b5220efc7e4f0c9a7c187c7dc07fe44d8ea3de4a1ad1a5"`
[INFO] [stdout] 7e5311e04007aeb339b5220efc7e4f0c9a7c187c7dc07fe44d8ea3de4a1ad1a5