[INFO] updating cached repository Dylan-DPC/cargo-caldera
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Dylan-DPC/cargo-caldera
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Dylan-DPC/cargo-caldera" "work/ex/beta-1.38-1/sources/1.37.0/gh/Dylan-DPC/cargo-caldera"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Dylan-DPC/cargo-caldera'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Dylan-DPC/cargo-caldera" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dylan-DPC/cargo-caldera"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dylan-DPC/cargo-caldera'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 271e492865081a1f33f9ead3e57d3ba6ca9edaf4
[INFO] sha for GitHub repo Dylan-DPC/cargo-caldera: 271e492865081a1f33f9ead3e57d3ba6ca9edaf4
[INFO] validating manifest of Dylan-DPC/cargo-caldera 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 Dylan-DPC/cargo-caldera 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 Dylan-DPC/cargo-caldera
[INFO] finished frobbing Dylan-DPC/cargo-caldera
[INFO] frobbed toml for Dylan-DPC/cargo-caldera written to work/ex/beta-1.38-1/sources/1.37.0/gh/Dylan-DPC/cargo-caldera/Cargo.toml
[INFO] started frobbing Dylan-DPC/cargo-caldera
[INFO] finished frobbing Dylan-DPC/cargo-caldera
[INFO] frobbed toml for Dylan-DPC/cargo-caldera written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dylan-DPC/cargo-caldera/Cargo.toml
[INFO] crate Dylan-DPC/cargo-caldera 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 Dylan-DPC/cargo-caldera 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/Dylan-DPC/cargo-caldera:/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] f7d6b0d75d200071496cd794b2b256ef6de547459beb4cdfc002c6e09dd254fc
[INFO] running `"docker" "start" "-a" "f7d6b0d75d200071496cd794b2b256ef6de547459beb4cdfc002c6e09dd254fc"`
[INFO] [stderr]    Compiling libc v0.2.47
[INFO] [stderr]    Compiling serde v1.0.84
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling structopt v0.2.14
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling cargo-caldera v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `path::PathBuf`
[INFO] [stderr]  --> src/main.rs:2:22
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::{io::Write, path::PathBuf};
[INFO] [stderr]   |                      ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `opt`
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let opt = Cli::from_args();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_opt`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path`
[INFO] [stderr]   --> src/runner.rs:38:20
[INFO] [stderr]    |
[INFO] [stderr] 38 |     pub fn version(path: &Path) -> Result<Version, Box<dyn Error>> {
[INFO] [stderr]    |                    ^^^^ help: consider prefixing with an underscore: `_path`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.89s
[INFO] running `"docker" "inspect" "f7d6b0d75d200071496cd794b2b256ef6de547459beb4cdfc002c6e09dd254fc"`
[INFO] running `"docker" "rm" "-f" "f7d6b0d75d200071496cd794b2b256ef6de547459beb4cdfc002c6e09dd254fc"`
[INFO] [stdout] f7d6b0d75d200071496cd794b2b256ef6de547459beb4cdfc002c6e09dd254fc
[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/Dylan-DPC/cargo-caldera:/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] 61d196c8c6178d5ee550b85297b5dc201441ee86f73b17f26180ca9665f56e9f
[INFO] running `"docker" "start" "-a" "61d196c8c6178d5ee550b85297b5dc201441ee86f73b17f26180ca9665f56e9f"`
[INFO] [stderr]    Compiling cargo-caldera v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `path::PathBuf`
[INFO] [stderr]  --> src/main.rs:2:22
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::{io::Write, path::PathBuf};
[INFO] [stderr]   |                      ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `opt`
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let opt = Cli::from_args();
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_opt`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path`
[INFO] [stderr]   --> src/runner.rs:38:20
[INFO] [stderr]    |
[INFO] [stderr] 38 |     pub fn version(path: &Path) -> Result<Version, Box<dyn Error>> {
[INFO] [stderr]    |                    ^^^^ help: consider prefixing with an underscore: `_path`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `"docker" "inspect" "61d196c8c6178d5ee550b85297b5dc201441ee86f73b17f26180ca9665f56e9f"`
[INFO] running `"docker" "rm" "-f" "61d196c8c6178d5ee550b85297b5dc201441ee86f73b17f26180ca9665f56e9f"`
[INFO] [stdout] 61d196c8c6178d5ee550b85297b5dc201441ee86f73b17f26180ca9665f56e9f
[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/Dylan-DPC/cargo-caldera:/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] f7980f5d7e3b71c2dc48585547fadee88785c7e1c24e770700d4ca1d8f7eb93c
[INFO] running `"docker" "start" "-a" "f7980f5d7e3b71c2dc48585547fadee88785c7e1c24e770700d4ca1d8f7eb93c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[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] [stderr]      Running /opt/crater/target/debug/deps/cargo_caldera-831b077fd9b89ad3
[INFO] running `"docker" "inspect" "f7980f5d7e3b71c2dc48585547fadee88785c7e1c24e770700d4ca1d8f7eb93c"`
[INFO] running `"docker" "rm" "-f" "f7980f5d7e3b71c2dc48585547fadee88785c7e1c24e770700d4ca1d8f7eb93c"`
[INFO] [stdout] f7980f5d7e3b71c2dc48585547fadee88785c7e1c24e770700d4ca1d8f7eb93c