[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 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/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 2c3a0699bf5c13ea8207bd070427527db742c56e2d6dce4bb5edf132d947028c
[INFO] running `"docker" "start" "-a" "2c3a0699bf5c13ea8207bd070427527db742c56e2d6dce4bb5edf132d947028c"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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 1.20s
[INFO] running `"docker" "inspect" "2c3a0699bf5c13ea8207bd070427527db742c56e2d6dce4bb5edf132d947028c"`
[INFO] running `"docker" "rm" "-f" "2c3a0699bf5c13ea8207bd070427527db742c56e2d6dce4bb5edf132d947028c"`
[INFO] [stdout] 2c3a0699bf5c13ea8207bd070427527db742c56e2d6dce4bb5edf132d947028c
[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/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] ff997a527c6e22e76dd73f0dbb20ebcf28d8403d5e0d90ddabb65d7da12bb671
[INFO] running `"docker" "start" "-a" "ff997a527c6e22e76dd73f0dbb20ebcf28d8403d5e0d90ddabb65d7da12bb671"`
[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 0.69s
[INFO] running `"docker" "inspect" "ff997a527c6e22e76dd73f0dbb20ebcf28d8403d5e0d90ddabb65d7da12bb671"`
[INFO] running `"docker" "rm" "-f" "ff997a527c6e22e76dd73f0dbb20ebcf28d8403d5e0d90ddabb65d7da12bb671"`
[INFO] [stdout] ff997a527c6e22e76dd73f0dbb20ebcf28d8403d5e0d90ddabb65d7da12bb671
[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/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] bb05e6b9449a1952bc6cf7c617f55a0407f24146e72ae98c548b4b00af2f9506
[INFO] running `"docker" "start" "-a" "bb05e6b9449a1952bc6cf7c617f55a0407f24146e72ae98c548b4b00af2f9506"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rfmt-21d4771d68297987
[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" "bb05e6b9449a1952bc6cf7c617f55a0407f24146e72ae98c548b4b00af2f9506"`
[INFO] running `"docker" "rm" "-f" "bb05e6b9449a1952bc6cf7c617f55a0407f24146e72ae98c548b4b00af2f9506"`
[INFO] [stdout] bb05e6b9449a1952bc6cf7c617f55a0407f24146e72ae98c548b4b00af2f9506