[INFO] fetching crate r-graph 0.1.3...
[INFO] testing r-graph-0.1.3 against 1.44.0 for beta-1.45-1
[INFO] extracting crate r-graph 0.1.3 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate r-graph 0.1.3 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 r-graph 0.1.3
[INFO] finished tweaking crates.io crate r-graph 0.1.3
[INFO] tweaked toml for crates.io crate r-graph 0.1.3 written to /workspace/builds/worker-1/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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 7fa1e4345c42cb6afc5de539fbf9f4add15c794b56fae5940eb01aab5b24db34
[INFO] running `"docker" "start" "-a" "7fa1e4345c42cb6afc5de539fbf9f4add15c794b56fae5940eb01aab5b24db34"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling r-graph v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(type_alias_impl_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Dot`
[INFO] [stderr]  --> src/wrapper/transaction.rs:2:29
[INFO] [stderr]   |
[INFO] [stderr] 2 | use crate::dev::{AddVertex, Dot, RemoveEdge, RemoveVertex};
[INFO] [stderr]   |                             ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::wrapper::logger::Logger`
[INFO] [stderr]  --> src/wrapper/transaction.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::wrapper::logger::Logger;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `r-graph`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7fa1e4345c42cb6afc5de539fbf9f4add15c794b56fae5940eb01aab5b24db34"`
[INFO] running `"docker" "rm" "-f" "7fa1e4345c42cb6afc5de539fbf9f4add15c794b56fae5940eb01aab5b24db34"`
[INFO] [stdout] 7fa1e4345c42cb6afc5de539fbf9f4add15c794b56fae5940eb01aab5b24db34