[INFO] updating cached repository Peter-Van-Drunen/readable
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Peter-Van-Drunen/readable
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Peter-Van-Drunen/readable" "work/ex/beta-1.38-1/sources/1.37.0/gh/Peter-Van-Drunen/readable"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Peter-Van-Drunen/readable'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Peter-Van-Drunen/readable" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Peter-Van-Drunen/readable"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Peter-Van-Drunen/readable'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0397b89f443baa6e0b13540e1204da7ef713794a
[INFO] sha for GitHub repo Peter-Van-Drunen/readable: 0397b89f443baa6e0b13540e1204da7ef713794a
[INFO] validating manifest of Peter-Van-Drunen/readable 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 Peter-Van-Drunen/readable 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 Peter-Van-Drunen/readable
[INFO] finished frobbing Peter-Van-Drunen/readable
[INFO] frobbed toml for Peter-Van-Drunen/readable written to work/ex/beta-1.38-1/sources/1.37.0/gh/Peter-Van-Drunen/readable/Cargo.toml
[INFO] started frobbing Peter-Van-Drunen/readable
[INFO] finished frobbing Peter-Van-Drunen/readable
[INFO] frobbed toml for Peter-Van-Drunen/readable written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Peter-Van-Drunen/readable/Cargo.toml
[INFO] crate Peter-Van-Drunen/readable 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 Peter-Van-Drunen/readable 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Peter-Van-Drunen/readable:/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] 14be4f2260d30fe71bd0d7d904d6bc658d6af44868150324287edd3643ab708a
[INFO] running `"docker" "start" "-a" "14be4f2260d30fe71bd0d7d904d6bc658d6af44868150324287edd3643ab708a"`
[INFO] [stderr]    Compiling readable v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `op_node` is never read
[INFO] [stderr]    --> src/main.rs:240:21
[INFO] [stderr]     |
[INFO] [stderr] 240 |             let mut op_node: Node = Node { t: "error_in_transformer".to_string(), val: "".to_string(), kids: Vec::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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     in_file.read_to_string(&mut s);
[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 1.09s
[INFO] running `"docker" "inspect" "14be4f2260d30fe71bd0d7d904d6bc658d6af44868150324287edd3643ab708a"`
[INFO] running `"docker" "rm" "-f" "14be4f2260d30fe71bd0d7d904d6bc658d6af44868150324287edd3643ab708a"`
[INFO] [stdout] 14be4f2260d30fe71bd0d7d904d6bc658d6af44868150324287edd3643ab708a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Peter-Van-Drunen/readable:/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] b9023d175b2efbd27fff033cd18e0f2f8f48cbfcfca4e13d4d5f7419da49b779
[INFO] running `"docker" "start" "-a" "b9023d175b2efbd27fff033cd18e0f2f8f48cbfcfca4e13d4d5f7419da49b779"`
[INFO] [stderr]    Compiling readable v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `op_node` is never read
[INFO] [stderr]    --> src/main.rs:240:21
[INFO] [stderr]     |
[INFO] [stderr] 240 |             let mut op_node: Node = Node { t: "error_in_transformer".to_string(), val: "".to_string(), kids: Vec::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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     in_file.read_to_string(&mut s);
[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" "b9023d175b2efbd27fff033cd18e0f2f8f48cbfcfca4e13d4d5f7419da49b779"`
[INFO] running `"docker" "rm" "-f" "b9023d175b2efbd27fff033cd18e0f2f8f48cbfcfca4e13d4d5f7419da49b779"`
[INFO] [stdout] b9023d175b2efbd27fff033cd18e0f2f8f48cbfcfca4e13d4d5f7419da49b779
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Peter-Van-Drunen/readable:/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] cb22cde5494f6ec14ce17be40917a826480fc704d10ddc7db954d13499c14879
[INFO] running `"docker" "start" "-a" "cb22cde5494f6ec14ce17be40917a826480fc704d10ddc7db954d13499c14879"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/readable-6d7b857a508d34b8
[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" "cb22cde5494f6ec14ce17be40917a826480fc704d10ddc7db954d13499c14879"`
[INFO] running `"docker" "rm" "-f" "cb22cde5494f6ec14ce17be40917a826480fc704d10ddc7db954d13499c14879"`
[INFO] [stdout] cb22cde5494f6ec14ce17be40917a826480fc704d10ddc7db954d13499c14879