[INFO] crate vfs 0.2.0 is already in cache
[INFO] extracting crate vfs 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/vfs/0.2.0
[INFO] extracting crate vfs 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/vfs/0.2.0
[INFO] validating manifest of vfs-0.2.0 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 vfs-0.2.0 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 vfs-0.2.0
[INFO] finished frobbing vfs-0.2.0
[INFO] frobbed toml for vfs-0.2.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/vfs/0.2.0/Cargo.toml
[INFO] started frobbing vfs-0.2.0
[INFO] finished frobbing vfs-0.2.0
[INFO] frobbed toml for vfs-0.2.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/vfs/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 vfs-0.2.0 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-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/vfs/0.2.0:/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] e63e320af1601f69ee17ed8aea341a0f747a8e03188766733a280c8d407b56f3
[INFO] running `"docker" "start" "-a" "e63e320af1601f69ee17ed8aea341a0f747a8e03188766733a280c8d407b56f3"`
[INFO] [stderr]    Compiling vfs v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable `openOptions` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:65:33
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn open_with_options(&self, openOptions: &OpenOptions) -> Result<Box<VFile>>;
[INFO] [stderr]    |                                 ^^^^^^^^^^^ help: convert the identifier to snake case: `open_options`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.66s
[INFO] running `"docker" "inspect" "e63e320af1601f69ee17ed8aea341a0f747a8e03188766733a280c8d407b56f3"`
[INFO] running `"docker" "rm" "-f" "e63e320af1601f69ee17ed8aea341a0f747a8e03188766733a280c8d407b56f3"`
[INFO] [stdout] e63e320af1601f69ee17ed8aea341a0f747a8e03188766733a280c8d407b56f3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/vfs/0.2.0:/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] f56faa650b692de4108d20971f75fd7c0c52a9163c4b3fa4d9bede31137f8a1a
[INFO] running `"docker" "start" "-a" "f56faa650b692de4108d20971f75fd7c0c52a9163c4b3fa4d9bede31137f8a1a"`
[INFO] [stderr]    Compiling vfs v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable `openOptions` should have a snake case name
[INFO] [stderr]   --> src/lib.rs:65:33
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn open_with_options(&self, openOptions: &OpenOptions) -> Result<Box<VFile>>;
[INFO] [stderr]    |                                 ^^^^^^^^^^^ help: convert the identifier to snake case: `open_options`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.40s
[INFO] running `"docker" "inspect" "f56faa650b692de4108d20971f75fd7c0c52a9163c4b3fa4d9bede31137f8a1a"`
[INFO] running `"docker" "rm" "-f" "f56faa650b692de4108d20971f75fd7c0c52a9163c4b3fa4d9bede31137f8a1a"`
[INFO] [stdout] f56faa650b692de4108d20971f75fd7c0c52a9163c4b3fa4d9bede31137f8a1a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/vfs/0.2.0:/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] f85c1343a7e1dcd17bf0c1ff2d44128c84f19a00a3f4395a5aa65e34064f3bd2
[INFO] running `"docker" "start" "-a" "f85c1343a7e1dcd17bf0c1ff2d44128c84f19a00a3f4395a5aa65e34064f3bd2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/vfs-89bd090c89461716
[INFO] [stdout] 
[INFO] [stdout] running 20 tests
[INFO] [stdout] test memory::tests::mkdir_fails_for_file ... ok
[INFO] [stdout] test memory::tests::mkdir ... ok
[INFO] [stdout] test memory::tests::access_directory_as_file ... ok
[INFO] [stdout] test memory::tests::file_name ... ok
[INFO] [stdout] test memory::tests::path_buf ... ok
[INFO] [stdout] test memory::tests::read_dir ... ok
[INFO] [stdout] test memory::tests::resolve ... ok
[INFO] [stdout] test memory::tests::rm ... ok
[INFO] [stdout] test memory::tests::parent ... ok
[INFO] [stdout] test memory::tests::read_empty_file ... ok
[INFO] [stdout] test memory::tests::append ... ok
[INFO] [stdout] test physical::tests::to_path_buf ... ok
[INFO] [stdout] test util::tests::mkdir ... ok
[INFO] [stdout] test memory::tests::rmdir ... ok
[INFO] [stderr]    Doc-tests vfs
[INFO] [stdout] test memory::tests::rmrf ... ok
[INFO] [stdout] test physical::tests::parent ... ok
[INFO] [stdout] test memory::tests::write_and_read_file ... ok
[INFO] [stdout] test physical::tests::read_dir ... ok
[INFO] [stdout] test physical::tests::read_file ... ok
[INFO] [stdout] test physical::tests::file_name ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 20 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] running `"docker" "inspect" "f85c1343a7e1dcd17bf0c1ff2d44128c84f19a00a3f4395a5aa65e34064f3bd2"`
[INFO] running `"docker" "rm" "-f" "f85c1343a7e1dcd17bf0c1ff2d44128c84f19a00a3f4395a5aa65e34064f3bd2"`
[INFO] [stdout] f85c1343a7e1dcd17bf0c1ff2d44128c84f19a00a3f4395a5aa65e34064f3bd2