[INFO] cloning repository mahulst/rust-playground-w
[INFO] running `"git" "clone" "--bare" "git://github.com/mahulst/rust-playground-w.git" "work/cache/sources/gh/mahulst/rust-playground-w"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/mahulst/rust-playground-w'...
[INFO] running `"git" "clone" "work/cache/sources/gh/mahulst/rust-playground-w" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mahulst/rust-playground-w"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mahulst/rust-playground-w'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mahulst/rust-playground-w" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/mahulst/rust-playground-w"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/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 master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mahulst/rust-playground-w on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "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/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/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/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/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/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mahulst/rust-playground-w against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-2/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mahulst/rust-playground-w:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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=forbid" "-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" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 263a10e98251a4ee6a0c41fd1c394bdd62f5357a77ebc65f5cd3d83d8fecbcc3
[INFO] running `"docker" "start" "-a" "263a10e98251a4ee6a0c41fd1c394bdd62f5357a77ebc65f5cd3d83d8fecbcc3"`
[INFO] [stderr]     Checking 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] 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 1.54s
[INFO] running `"docker" "inspect" "263a10e98251a4ee6a0c41fd1c394bdd62f5357a77ebc65f5cd3d83d8fecbcc3"`
[INFO] running `"docker" "rm" "-f" "263a10e98251a4ee6a0c41fd1c394bdd62f5357a77ebc65f5cd3d83d8fecbcc3"`
[INFO] [stdout] 263a10e98251a4ee6a0c41fd1c394bdd62f5357a77ebc65f5cd3d83d8fecbcc3