[INFO] cloning repository https://github.com/jonathan-lemos/filediff
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jonathan-lemos/filediff" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonathan-lemos%2Ffilediff"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonathan-lemos%2Ffilediff'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1bba88c631d47d7991f8b4d4f6d7aed84dbc622a
[INFO] testing jonathan-lemos/filediff against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonathan-lemos%2Ffilediff" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jonathan-lemos/filediff 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/jonathan-lemos/filediff
[INFO] finished tweaking git repo https://github.com/jonathan-lemos/filediff
[INFO] tweaked toml for git repo https://github.com/jonathan-lemos/filediff written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/jonathan-lemos/filediff 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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 51aa094f2a97a36cc574495c1d75a3bdc53bc050e263794c09f5a839ad391214
[INFO] running `"docker" "start" "-a" "51aa094f2a97a36cc574495c1d75a3bdc53bc050e263794c09f5a839ad391214"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syn v1.0.25
[INFO] [stderr]    Compiling serde_derive v1.0.110
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling serde_json v1.0.53
[INFO] [stderr]    Compiling filediff v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `HashSet`
[INFO] [stderr]  --> src/filesystem.rs:7:24
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::collections::{HashSet, HashMap};
[INFO] [stderr]   |                        ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BorrowMut`
[INFO] [stderr]  --> src/filesystem.rs:8:19
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::borrow::{BorrowMut, Borrow};
[INFO] [stderr]   |                   ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0069]: `return;` in a function whose return type is not `()`
[INFO] [stderr]   --> src/filesystem.rs:66:58
[INFO] [stderr]    |
[INFO] [stderr] 66 |         let list = unwrap_result_or![fs::read_dir(path), return];
[INFO] [stderr]    |                                                          ^^^^^^ return type is not `()`
[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 E0069`.
[INFO] [stderr] error: could not compile `filediff`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "51aa094f2a97a36cc574495c1d75a3bdc53bc050e263794c09f5a839ad391214"`
[INFO] running `"docker" "rm" "-f" "51aa094f2a97a36cc574495c1d75a3bdc53bc050e263794c09f5a839ad391214"`
[INFO] [stdout] 51aa094f2a97a36cc574495c1d75a3bdc53bc050e263794c09f5a839ad391214