[INFO] updating cached repository XYC-EXP/rfmt
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/XYC-EXP/rfmt
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/XYC-EXP/rfmt" "work/ex/beta-1.38-1/sources/1.37.0/gh/XYC-EXP/rfmt"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/XYC-EXP/rfmt'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/XYC-EXP/rfmt" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/XYC-EXP/rfmt"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/XYC-EXP/rfmt'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 95c76e9df60e26081f9a17d8c41716632177ec25
[INFO] sha for GitHub repo XYC-EXP/rfmt: 95c76e9df60e26081f9a17d8c41716632177ec25
[INFO] validating manifest of XYC-EXP/rfmt 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 XYC-EXP/rfmt 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 XYC-EXP/rfmt
[INFO] finished frobbing XYC-EXP/rfmt
[INFO] frobbed toml for XYC-EXP/rfmt written to work/ex/beta-1.38-1/sources/1.37.0/gh/XYC-EXP/rfmt/Cargo.toml
[INFO] started frobbing XYC-EXP/rfmt
[INFO] finished frobbing XYC-EXP/rfmt
[INFO] frobbed toml for XYC-EXP/rfmt written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/XYC-EXP/rfmt/Cargo.toml
[INFO] crate XYC-EXP/rfmt 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 XYC-EXP/rfmt against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/XYC-EXP/rfmt:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 9865653143d3d1e5eb96b97a8de10b0ff4eea222b53f67529cc6b8d379b82dbc
[INFO] running `"docker" "start" "-a" "9865653143d3d1e5eb96b97a8de10b0ff4eea222b53f67529cc6b8d379b82dbc"`
[INFO] [stderr]    Compiling rfmt v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/executor.rs:4:6
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut output: Vec<String> = Vec::new();
[INFO] [stderr]   |         ----^^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `list_files`
[INFO] [stderr]  --> src/executor.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn list_files() -> Vec<String> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.12s
[INFO] running `"docker" "inspect" "9865653143d3d1e5eb96b97a8de10b0ff4eea222b53f67529cc6b8d379b82dbc"`
[INFO] running `"docker" "rm" "-f" "9865653143d3d1e5eb96b97a8de10b0ff4eea222b53f67529cc6b8d379b82dbc"`
[INFO] [stdout] 9865653143d3d1e5eb96b97a8de10b0ff4eea222b53f67529cc6b8d379b82dbc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/XYC-EXP/rfmt:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 73fba1d9363aee98b36bb47c6d4c1c0e30623a63fde4daa5dfaf982bba30269f
[INFO] running `"docker" "start" "-a" "73fba1d9363aee98b36bb47c6d4c1c0e30623a63fde4daa5dfaf982bba30269f"`
[INFO] [stderr]    Compiling rfmt v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/executor.rs:4:6
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let mut output: Vec<String> = Vec::new();
[INFO] [stderr]   |         ----^^^^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `list_files`
[INFO] [stderr]  --> src/executor.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn list_files() -> Vec<String> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `"docker" "inspect" "73fba1d9363aee98b36bb47c6d4c1c0e30623a63fde4daa5dfaf982bba30269f"`
[INFO] running `"docker" "rm" "-f" "73fba1d9363aee98b36bb47c6d4c1c0e30623a63fde4daa5dfaf982bba30269f"`
[INFO] [stdout] 73fba1d9363aee98b36bb47c6d4c1c0e30623a63fde4daa5dfaf982bba30269f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/XYC-EXP/rfmt:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] b9a329c907764ae22d6f6ed69d32ae3d236aa003e68789beb375167ca17cd4d2
[INFO] running `"docker" "start" "-a" "b9a329c907764ae22d6f6ed69d32ae3d236aa003e68789beb375167ca17cd4d2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rfmt-3b178a862cea8621
[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" "b9a329c907764ae22d6f6ed69d32ae3d236aa003e68789beb375167ca17cd4d2"`
[INFO] running `"docker" "rm" "-f" "b9a329c907764ae22d6f6ed69d32ae3d236aa003e68789beb375167ca17cd4d2"`
[INFO] [stdout] b9a329c907764ae22d6f6ed69d32ae3d236aa003e68789beb375167ca17cd4d2