[INFO] updating cached repository mahulst/rust-playground-w
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mahulst/rust-playground-w
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mahulst/rust-playground-w" "work/ex/beta-1.37-6/sources/1.36.0/gh/mahulst/rust-playground-w"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/mahulst/rust-playground-w'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mahulst/rust-playground-w" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mahulst/rust-playground-w"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mahulst/rust-playground-w'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e981b7f6809b07c226c6f60be4ee92d86899f34f
[INFO] sha for GitHub repo mahulst/rust-playground-w: e981b7f6809b07c226c6f60be4ee92d86899f34f
[INFO] validating manifest of mahulst/rust-playground-w 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 mahulst/rust-playground-w 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 mahulst/rust-playground-w
[INFO] finished frobbing mahulst/rust-playground-w
[INFO] frobbed toml for mahulst/rust-playground-w written to work/ex/beta-1.37-6/sources/1.36.0/gh/mahulst/rust-playground-w/Cargo.toml
[INFO] started frobbing mahulst/rust-playground-w
[INFO] finished frobbing mahulst/rust-playground-w
[INFO] frobbed toml for mahulst/rust-playground-w written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mahulst/rust-playground-w/Cargo.toml
[INFO] crate mahulst/rust-playground-w 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mahulst/rust-playground-w against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/mahulst/rust-playground-w:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 5d13de8588bf2b0bdd5bd0c1ef6073a57211e228f07ce866e1e5d8aceb130ec6
[INFO] running `"docker" "start" "-a" "5d13de8588bf2b0bdd5bd0c1ef6073a57211e228f07ce866e1e5d8aceb130ec6"`
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/lib.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.85s
[INFO] running `"docker" "inspect" "5d13de8588bf2b0bdd5bd0c1ef6073a57211e228f07ce866e1e5d8aceb130ec6"`
[INFO] running `"docker" "rm" "-f" "5d13de8588bf2b0bdd5bd0c1ef6073a57211e228f07ce866e1e5d8aceb130ec6"`
[INFO] [stdout] 5d13de8588bf2b0bdd5bd0c1ef6073a57211e228f07ce866e1e5d8aceb130ec6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/mahulst/rust-playground-w:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] fd7684e9f40cbb5812a4f39ab8daf1bd87afb6f94009e7408a95c92a27363ef4
[INFO] running `"docker" "start" "-a" "fd7684e9f40cbb5812a4f39ab8daf1bd87afb6f94009e7408a95c92a27363ef4"`
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/lib.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.82s
[INFO] running `"docker" "inspect" "fd7684e9f40cbb5812a4f39ab8daf1bd87afb6f94009e7408a95c92a27363ef4"`
[INFO] running `"docker" "rm" "-f" "fd7684e9f40cbb5812a4f39ab8daf1bd87afb6f94009e7408a95c92a27363ef4"`
[INFO] [stdout] fd7684e9f40cbb5812a4f39ab8daf1bd87afb6f94009e7408a95c92a27363ef4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/mahulst/rust-playground-w:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 17bcb4b42389dce580069bea0ee273b4e7f4cf62b5cb58b20e4f1125126bc3f6
[INFO] running `"docker" "start" "-a" "17bcb4b42389dce580069bea0ee273b4e7f4cf62b5cb58b20e4f1125126bc3f6"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/minigrep-ff177ee8f5f85702
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::case_insensitive ... ok
[INFO] [stdout] test tests::case_sensitive ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/minigrep-fcb5693f8a7546cf
[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] [stderr]    Doc-tests minigrep
[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" "17bcb4b42389dce580069bea0ee273b4e7f4cf62b5cb58b20e4f1125126bc3f6"`
[INFO] running `"docker" "rm" "-f" "17bcb4b42389dce580069bea0ee273b4e7f4cf62b5cb58b20e4f1125126bc3f6"`
[INFO] [stdout] 17bcb4b42389dce580069bea0ee273b4e7f4cf62b5cb58b20e4f1125126bc3f6