[INFO] updating cached repository https://github.com/IgorBoyarshin/vffm
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/IgorBoyarshin/vffm
[INFO] [stderr]    5cce9d0..9763e11  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9763e11f2c21deaaeae4bc37032e6d59f8abdbf6
[INFO] testing IgorBoyarshin/vffm against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIgorBoyarshin%2Fvffm" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/IgorBoyarshin/vffm on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/IgorBoyarshin/vffm
[INFO] finished tweaking git repo https://github.com/IgorBoyarshin/vffm
[INFO] tweaked toml for git repo https://github.com/IgorBoyarshin/vffm written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/IgorBoyarshin/vffm 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] 08b0bbd11ef70be2270b7edb9f9295c604b80e6019ece40ee32e2b9bf4d35b8b
[INFO] running `"docker" "start" "-a" "08b0bbd11ef70be2270b7edb9f9295c604b80e6019ece40ee32e2b9bf4d35b8b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling ncurses v5.99.0
[INFO] [stderr]    Compiling pancurses v0.16.1
[INFO] [stderr]    Compiling vffm v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(drain_filter)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(const_str_len)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/filesystem.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 176 |     (!meta.is_file() && !meta.is_dir())
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `vffm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "08b0bbd11ef70be2270b7edb9f9295c604b80e6019ece40ee32e2b9bf4d35b8b"`
[INFO] running `"docker" "rm" "-f" "08b0bbd11ef70be2270b7edb9f9295c604b80e6019ece40ee32e2b9bf4d35b8b"`
[INFO] [stdout] 08b0bbd11ef70be2270b7edb9f9295c604b80e6019ece40ee32e2b9bf4d35b8b