[INFO] cloning repository XYC-EXP/rfmt
[INFO] running `"git" "clone" "--bare" "git://github.com/XYC-EXP/rfmt.git" "work/cache/sources/gh/XYC-EXP/rfmt"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/XYC-EXP/rfmt'...
[INFO] running `"git" "clone" "work/cache/sources/gh/XYC-EXP/rfmt" "work/ex/beta-1.37-6/sources/1.36.0/gh/XYC-EXP/rfmt"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/XYC-EXP/rfmt'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/XYC-EXP/rfmt" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/XYC-EXP/rfmt"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/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 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of XYC-EXP/rfmt 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 XYC-EXP/rfmt
[INFO] finished frobbing XYC-EXP/rfmt
[INFO] frobbed toml for XYC-EXP/rfmt written to work/ex/beta-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/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" "+1.36.0" "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 XYC-EXP/rfmt 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-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 9c17a4a7ef5a508763e9a5ad730302f97fcea6fa28ddccacfda42531efbf565f
[INFO] running `"docker" "start" "-a" "9c17a4a7ef5a508763e9a5ad730302f97fcea6fa28ddccacfda42531efbf565f"`
[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 1.17s
[INFO] running `"docker" "inspect" "9c17a4a7ef5a508763e9a5ad730302f97fcea6fa28ddccacfda42531efbf565f"`
[INFO] running `"docker" "rm" "-f" "9c17a4a7ef5a508763e9a5ad730302f97fcea6fa28ddccacfda42531efbf565f"`
[INFO] [stdout] 9c17a4a7ef5a508763e9a5ad730302f97fcea6fa28ddccacfda42531efbf565f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 3b72b84314be77bd0b0a698cad825c705021339705d6347493dfea2a32c0a3c9
[INFO] running `"docker" "start" "-a" "3b72b84314be77bd0b0a698cad825c705021339705d6347493dfea2a32c0a3c9"`
[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 0.57s
[INFO] running `"docker" "inspect" "3b72b84314be77bd0b0a698cad825c705021339705d6347493dfea2a32c0a3c9"`
[INFO] running `"docker" "rm" "-f" "3b72b84314be77bd0b0a698cad825c705021339705d6347493dfea2a32c0a3c9"`
[INFO] [stdout] 3b72b84314be77bd0b0a698cad825c705021339705d6347493dfea2a32c0a3c9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] e953c3cd9888164d4ed13a74bdc3b774fbbcb9f9c59e9bd002ec4ff67c741265
[INFO] running `"docker" "start" "-a" "e953c3cd9888164d4ed13a74bdc3b774fbbcb9f9c59e9bd002ec4ff67c741265"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rfmt-2c4f842d7f8130e9
[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" "e953c3cd9888164d4ed13a74bdc3b774fbbcb9f9c59e9bd002ec4ff67c741265"`
[INFO] running `"docker" "rm" "-f" "e953c3cd9888164d4ed13a74bdc3b774fbbcb9f9c59e9bd002ec4ff67c741265"`
[INFO] [stdout] e953c3cd9888164d4ed13a74bdc3b774fbbcb9f9c59e9bd002ec4ff67c741265