[INFO] updating cached repository vksmgr/read_file
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vksmgr/read_file
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vksmgr/read_file" "work/ex/beta-1.38-1/sources/1.37.0/gh/vksmgr/read_file"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/vksmgr/read_file'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vksmgr/read_file" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vksmgr/read_file"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vksmgr/read_file'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f96ec36295573c4745725ddbaa5f3b90a4d72e4b
[INFO] sha for GitHub repo vksmgr/read_file: f96ec36295573c4745725ddbaa5f3b90a4d72e4b
[INFO] validating manifest of vksmgr/read_file 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 vksmgr/read_file 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 vksmgr/read_file
[INFO] finished frobbing vksmgr/read_file
[INFO] frobbed toml for vksmgr/read_file written to work/ex/beta-1.38-1/sources/1.37.0/gh/vksmgr/read_file/Cargo.toml
[INFO] started frobbing vksmgr/read_file
[INFO] finished frobbing vksmgr/read_file
[INFO] frobbed toml for vksmgr/read_file written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vksmgr/read_file/Cargo.toml
[INFO] crate vksmgr/read_file 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 vksmgr/read_file against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/vksmgr/read_file:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] bbf5fc747ddc92c65efd64bf9c88f33fe342065b0ac1f78c78fab24d952805f3
[INFO] running `"docker" "start" "-a" "bbf5fc747ddc92c65efd64bf9c88f33fe342065b0ac1f78c78fab24d952805f3"`
[INFO] [stderr]    Compiling os v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_right': superseded by `trim_end`
[INFO] [stderr]   --> src/main.rs:37:37
[INFO] [stderr]    |
[INFO] [stderr] 37 |                 let line = self.buf.trim_right();
[INFO] [stderr]    |                                     ^^^^^^^^^^ help: replace the use of the deprecated item: `trim_end`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     read_all_lines("test.txt");
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `"docker" "inspect" "bbf5fc747ddc92c65efd64bf9c88f33fe342065b0ac1f78c78fab24d952805f3"`
[INFO] running `"docker" "rm" "-f" "bbf5fc747ddc92c65efd64bf9c88f33fe342065b0ac1f78c78fab24d952805f3"`
[INFO] [stdout] bbf5fc747ddc92c65efd64bf9c88f33fe342065b0ac1f78c78fab24d952805f3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/vksmgr/read_file:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 358b97eb5dd049e45efe1c0b3e16164e309b8e478cbe61b514fc88fbfa66c57b
[INFO] running `"docker" "start" "-a" "358b97eb5dd049e45efe1c0b3e16164e309b8e478cbe61b514fc88fbfa66c57b"`
[INFO] [stderr]    Compiling os v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_right': superseded by `trim_end`
[INFO] [stderr]   --> src/main.rs:37:37
[INFO] [stderr]    |
[INFO] [stderr] 37 |                 let line = self.buf.trim_right();
[INFO] [stderr]    |                                     ^^^^^^^^^^ help: replace the use of the deprecated item: `trim_end`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     read_all_lines("test.txt");
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `"docker" "inspect" "358b97eb5dd049e45efe1c0b3e16164e309b8e478cbe61b514fc88fbfa66c57b"`
[INFO] running `"docker" "rm" "-f" "358b97eb5dd049e45efe1c0b3e16164e309b8e478cbe61b514fc88fbfa66c57b"`
[INFO] [stdout] 358b97eb5dd049e45efe1c0b3e16164e309b8e478cbe61b514fc88fbfa66c57b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/vksmgr/read_file:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] f2be96e589916fbfe04150f7a60505a04203714f4fb80475192ab88a09aea9e3
[INFO] running `"docker" "start" "-a" "f2be96e589916fbfe04150f7a60505a04203714f4fb80475192ab88a09aea9e3"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/os-d71a4fcbab2dd9e7
[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" "f2be96e589916fbfe04150f7a60505a04203714f4fb80475192ab88a09aea9e3"`
[INFO] running `"docker" "rm" "-f" "f2be96e589916fbfe04150f7a60505a04203714f4fb80475192ab88a09aea9e3"`
[INFO] [stdout] f2be96e589916fbfe04150f7a60505a04203714f4fb80475192ab88a09aea9e3