[INFO] updating cached repository waku-waku/rust-samples
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/waku-waku/rust-samples
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/waku-waku/rust-samples" "work/ex/beta-1.37-6/sources/1.36.0/gh/waku-waku/rust-samples"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/waku-waku/rust-samples'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/waku-waku/rust-samples" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/waku-waku/rust-samples"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/waku-waku/rust-samples'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ce06c702b94b5f8274bfac66e57d84538f10c6f8
[INFO] sha for GitHub repo waku-waku/rust-samples: ce06c702b94b5f8274bfac66e57d84538f10c6f8
[INFO] validating manifest of waku-waku/rust-samples on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of waku-waku/rust-samples on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing waku-waku/rust-samples
[INFO] finished frobbing waku-waku/rust-samples
[INFO] frobbed toml for waku-waku/rust-samples written to work/ex/beta-1.37-6/sources/1.36.0/gh/waku-waku/rust-samples/Cargo.toml
[INFO] started frobbing waku-waku/rust-samples
[INFO] finished frobbing waku-waku/rust-samples
[INFO] frobbed toml for waku-waku/rust-samples written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/waku-waku/rust-samples/Cargo.toml
[INFO] crate waku-waku/rust-samples already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing waku-waku/rust-samples against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/waku-waku/rust-samples:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 9b7baffa761a6aec54957a937b91bcce7a41384b4ce9d5d3f92b73d4a58cfbad
[INFO] running `"docker" "start" "-a" "9b7baffa761a6aec54957a937b91bcce7a41384b4ce9d5d3f92b73d4a58cfbad"`
[INFO] [stderr]    Compiling rust-samples v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `src` is never read
[INFO] [stderr]   --> src/make_rust_file.rs:56:10
[INFO] [stderr]    |
[INFO] [stderr] 56 |     let mut src = String::new();
[INFO] [stderr]    |             ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `string` is never read
[INFO] [stderr]   --> src/make_rust_file.rs:79:10
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let mut string = String::new();
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.91s
[INFO] running `"docker" "inspect" "9b7baffa761a6aec54957a937b91bcce7a41384b4ce9d5d3f92b73d4a58cfbad"`
[INFO] running `"docker" "rm" "-f" "9b7baffa761a6aec54957a937b91bcce7a41384b4ce9d5d3f92b73d4a58cfbad"`
[INFO] [stdout] 9b7baffa761a6aec54957a937b91bcce7a41384b4ce9d5d3f92b73d4a58cfbad
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/waku-waku/rust-samples:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 79bfb458c4946e9e0b01f831ac47c514e32938d884269187b9f62a78e21fe45e
[INFO] running `"docker" "start" "-a" "79bfb458c4946e9e0b01f831ac47c514e32938d884269187b9f62a78e21fe45e"`
[INFO] [stderr]    Compiling rust-samples v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `src` is never read
[INFO] [stderr]   --> src/make_rust_file.rs:56:10
[INFO] [stderr]    |
[INFO] [stderr] 56 |     let mut src = String::new();
[INFO] [stderr]    |             ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `string` is never read
[INFO] [stderr]   --> src/make_rust_file.rs:79:10
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let mut string = String::new();
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.67s
[INFO] running `"docker" "inspect" "79bfb458c4946e9e0b01f831ac47c514e32938d884269187b9f62a78e21fe45e"`
[INFO] running `"docker" "rm" "-f" "79bfb458c4946e9e0b01f831ac47c514e32938d884269187b9f62a78e21fe45e"`
[INFO] [stdout] 79bfb458c4946e9e0b01f831ac47c514e32938d884269187b9f62a78e21fe45e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/waku-waku/rust-samples:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 2604d723ea5cf336be9620b691541db02e992971d45103add171ede9a4ad1dcb
[INFO] running `"docker" "start" "-a" "2604d723ea5cf336be9620b691541db02e992971d45103add171ede9a4ad1dcb"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mrf-963979ca115103e2
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sample_create_file-6a624881470421ef
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sample_fizzbuzz-9bbdbe214a607667
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sample_input-ccfca4d537d5976c
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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] [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] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sample_let-74359f8709faf9ba
[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] [stderr]      Running /opt/crater/target/debug/deps/sample_square_sum-d5230eee0e12f786
[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" "2604d723ea5cf336be9620b691541db02e992971d45103add171ede9a4ad1dcb"`
[INFO] running `"docker" "rm" "-f" "2604d723ea5cf336be9620b691541db02e992971d45103add171ede9a4ad1dcb"`
[INFO] [stdout] 2604d723ea5cf336be9620b691541db02e992971d45103add171ede9a4ad1dcb