[INFO] updating cached repository b-m-f/rust_playground
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/b-m-f/rust_playground
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/b-m-f/rust_playground" "work/ex/beta-1.38-1/sources/1.37.0/gh/b-m-f/rust_playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/b-m-f/rust_playground'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/b-m-f/rust_playground" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/b-m-f/rust_playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/b-m-f/rust_playground'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fd5f5c1e312db99abdf4b07d809f0735db153586
[INFO] sha for GitHub repo b-m-f/rust_playground: fd5f5c1e312db99abdf4b07d809f0735db153586
[INFO] validating manifest of b-m-f/rust_playground 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 b-m-f/rust_playground 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 b-m-f/rust_playground
[INFO] finished frobbing b-m-f/rust_playground
[INFO] frobbed toml for b-m-f/rust_playground written to work/ex/beta-1.38-1/sources/1.37.0/gh/b-m-f/rust_playground/Cargo.toml
[INFO] started frobbing b-m-f/rust_playground
[INFO] finished frobbing b-m-f/rust_playground
[INFO] frobbed toml for b-m-f/rust_playground written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/b-m-f/rust_playground/Cargo.toml
[INFO] crate b-m-f/rust_playground 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 b-m-f/rust_playground 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/b-m-f/rust_playground:/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] 75b25eb53b0ca99b87ddd24326192dc701ab174e7a9f5f45a853cecdcaa86cf6
[INFO] running `"docker" "start" "-a" "75b25eb53b0ca99b87ddd24326192dc701ab174e7a9f5f45a853cecdcaa86cf6"`
[INFO] [stderr]    Compiling fs_examples v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `factorial_recursive`
[INFO] [stderr]  --> src/math.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn factorial_recursive(n: i64) -> i64 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `factorial`
[INFO] [stderr]  --> src/math.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn factorial (n: i64) -> i64 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.07s
[INFO] running `"docker" "inspect" "75b25eb53b0ca99b87ddd24326192dc701ab174e7a9f5f45a853cecdcaa86cf6"`
[INFO] running `"docker" "rm" "-f" "75b25eb53b0ca99b87ddd24326192dc701ab174e7a9f5f45a853cecdcaa86cf6"`
[INFO] [stdout] 75b25eb53b0ca99b87ddd24326192dc701ab174e7a9f5f45a853cecdcaa86cf6
[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/b-m-f/rust_playground:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 219cb19c1ed601f88c6d35af3609759b4b544cb230a03950a2884f6eef33e977
[INFO] running `"docker" "start" "-a" "219cb19c1ed601f88c6d35af3609759b4b544cb230a03950a2884f6eef33e977"`
[INFO] [stderr]    Compiling fs_examples v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `factorial_recursive`
[INFO] [stderr]  --> src/math.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn factorial_recursive(n: i64) -> i64 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `factorial`
[INFO] [stderr]  --> src/math.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn factorial (n: i64) -> i64 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `"docker" "inspect" "219cb19c1ed601f88c6d35af3609759b4b544cb230a03950a2884f6eef33e977"`
[INFO] running `"docker" "rm" "-f" "219cb19c1ed601f88c6d35af3609759b4b544cb230a03950a2884f6eef33e977"`
[INFO] [stdout] 219cb19c1ed601f88c6d35af3609759b4b544cb230a03950a2884f6eef33e977
[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/b-m-f/rust_playground:/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" "test" "--frozen"`
[INFO] [stdout] cd4faae3ad580f5af8615871aaa96cc046bf986e3b5652b3c30600f3c5e64a13
[INFO] running `"docker" "start" "-a" "cd4faae3ad580f5af8615871aaa96cc046bf986e3b5652b3c30600f3c5e64a13"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/fs_examples-3ea97de72745ee78
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "cd4faae3ad580f5af8615871aaa96cc046bf986e3b5652b3c30600f3c5e64a13"`
[INFO] running `"docker" "rm" "-f" "cd4faae3ad580f5af8615871aaa96cc046bf986e3b5652b3c30600f3c5e64a13"`
[INFO] [stdout] cd4faae3ad580f5af8615871aaa96cc046bf986e3b5652b3c30600f3c5e64a13