[INFO] updating cached repository https://github.com/gterzian/workflow_executor
[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] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d0ce8e2068ae16b118de72d48794887fe454ee6d
[INFO] testing gterzian/workflow_executor against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgterzian%2Fworkflow_executor" "/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/gterzian/workflow_executor on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/gterzian/workflow_executor
[INFO] finished tweaking git repo https://github.com/gterzian/workflow_executor
[INFO] tweaked toml for git repo https://github.com/gterzian/workflow_executor written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/gterzian/workflow_executor already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "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" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stdout] 415e7027fa2384afdbd91807d6583258bf47d753f40a059c8a3ee2b6ec5ab98d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "415e7027fa2384afdbd91807d6583258bf47d753f40a059c8a3ee2b6ec5ab98d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling workflow v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::sync::mpsc::Select`
[INFO] [stderr]  --> src/main.rs:5:23
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::sync::mpsc::{Select, Sender, Receiver, channel};
[INFO] [stderr]   |                       ^^^^^^ no `Select` in `sync::mpsc`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(mpsc_select)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `workflow`
[INFO] [stderr]    --> src/main.rs:1:1
[INFO] [stderr]     |
[INFO] [stderr] 1   | / #![feature(mpsc_select)]
[INFO] [stderr] 2   | |
[INFO] [stderr] 3   | | use std::cell::Cell;
[INFO] [stderr] 4   | | use std::collections::{HashMap, VecDeque};
[INFO] [stderr] ...   |
[INFO] [stderr] 263 | |     }
[INFO] [stderr] 264 | | }
[INFO] [stderr]     | |_^ consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554, E0601.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not compile `workflow`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "415e7027fa2384afdbd91807d6583258bf47d753f40a059c8a3ee2b6ec5ab98d"`
[INFO] running `"docker" "rm" "-f" "415e7027fa2384afdbd91807d6583258bf47d753f40a059c8a3ee2b6ec5ab98d"`
[INFO] [stdout] 415e7027fa2384afdbd91807d6583258bf47d753f40a059c8a3ee2b6ec5ab98d