[INFO] updating cached repository leshow/rust-filter-map-reduce-bench
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/leshow/rust-filter-map-reduce-bench
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/leshow/rust-filter-map-reduce-bench" "work/ex/beta-1.38-1/sources/1.37.0/gh/leshow/rust-filter-map-reduce-bench"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/leshow/rust-filter-map-reduce-bench'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/leshow/rust-filter-map-reduce-bench" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/leshow/rust-filter-map-reduce-bench"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/leshow/rust-filter-map-reduce-bench'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] be964def3658f3365e1f356643269ac6bb5f3734
[INFO] sha for GitHub repo leshow/rust-filter-map-reduce-bench: be964def3658f3365e1f356643269ac6bb5f3734
[INFO] validating manifest of leshow/rust-filter-map-reduce-bench on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of leshow/rust-filter-map-reduce-bench on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing leshow/rust-filter-map-reduce-bench
[INFO] finished frobbing leshow/rust-filter-map-reduce-bench
[INFO] frobbed toml for leshow/rust-filter-map-reduce-bench written to work/ex/beta-1.38-1/sources/1.37.0/gh/leshow/rust-filter-map-reduce-bench/Cargo.toml
[INFO] started frobbing leshow/rust-filter-map-reduce-bench
[INFO] finished frobbing leshow/rust-filter-map-reduce-bench
[INFO] frobbed toml for leshow/rust-filter-map-reduce-bench written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/leshow/rust-filter-map-reduce-bench/Cargo.toml
[INFO] crate leshow/rust-filter-map-reduce-bench already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing leshow/rust-filter-map-reduce-bench against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/leshow/rust-filter-map-reduce-bench:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b5ec8e4ab3c2afcd43b3e46c6b1aab954008a2653d527d59c333dd327b0d04b2
[INFO] running `"docker" "start" "-a" "b5ec8e4ab3c2afcd43b3e46c6b1aab954008a2653d527d59c333dd327b0d04b2"`
[INFO] [stderr]    Compiling fold-test v0.0.1 (/opt/crater/workdir)
[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(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/main.rs:23:14
[INFO] [stderr]    |
[INFO] [stderr] 23 |     for x in (0..iterations) {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `fold_test`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0601.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `fold-test`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b5ec8e4ab3c2afcd43b3e46c6b1aab954008a2653d527d59c333dd327b0d04b2"`
[INFO] running `"docker" "rm" "-f" "b5ec8e4ab3c2afcd43b3e46c6b1aab954008a2653d527d59c333dd327b0d04b2"`
[INFO] [stdout] b5ec8e4ab3c2afcd43b3e46c6b1aab954008a2653d527d59c333dd327b0d04b2