[INFO] updating cached repository prewk/next_version
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/prewk/next_version
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/prewk/next_version" "work/ex/beta-1.37-6/sources/1.36.0/gh/prewk/next_version"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/prewk/next_version'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/prewk/next_version" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/prewk/next_version"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/prewk/next_version'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 705c6ba0ea0d88e06a724f1221a947f574e0e039
[INFO] sha for GitHub repo prewk/next_version: 705c6ba0ea0d88e06a724f1221a947f574e0e039
[INFO] validating manifest of prewk/next_version 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 prewk/next_version 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 prewk/next_version
[INFO] finished frobbing prewk/next_version
[INFO] frobbed toml for prewk/next_version written to work/ex/beta-1.37-6/sources/1.36.0/gh/prewk/next_version/Cargo.toml
[INFO] started frobbing prewk/next_version
[INFO] finished frobbing prewk/next_version
[INFO] frobbed toml for prewk/next_version written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/prewk/next_version/Cargo.toml
[INFO] crate prewk/next_version 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] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing prewk/next_version 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-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/prewk/next_version:/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] 6e2e569a33e3e0642a8d8101c8d380bc8a760715bceb6cc530b19784b08cade0
[INFO] running `"docker" "start" "-a" "6e2e569a33e3e0642a8d8101c8d380bc8a760715bceb6cc530b19784b08cade0"`
[INFO] [stderr]    Compiling gcc v0.3.51
[INFO] [stderr]    Compiling unicode-segmentation v1.1.0
[INFO] [stderr]    Compiling openssl-probe v0.1.1
[INFO] [stderr]    Compiling term_size v0.3.0
[INFO] [stderr]    Compiling atty v0.2.2
[INFO] [stderr]    Compiling semver v0.7.0
[INFO] [stderr]    Compiling url v1.5.1
[INFO] [stderr]    Compiling textwrap v0.6.0
[INFO] [stderr]    Compiling clap v2.25.1
[INFO] [stderr] warning[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/url-1.5.1/src/form_urlencoded.rs:251:40
[INFO] [stderr]     |
[INFO] [stderr] 249 | impl<'a> Target for ::UrlQuery<'a> {
[INFO] [stderr]     |      -- lifetime `'a` defined here
[INFO] [stderr] 250 |     fn as_mut_string(&mut self) -> &mut String { &mut self.url.serialization }
[INFO] [stderr] 251 |     fn finish(self) -> &'a mut ::Url { self.url }
[INFO] [stderr]     |                                        ^^^^^^^^ - here, drop of `self` needs exclusive access to `*self.url`, because the type `UrlQuery<'_>` implements the `Drop` trait
[INFO] [stderr]     |                                        |
[INFO] [stderr]     |                                        returning this value requires that `*self.url` is borrowed for `'a`
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr] 
[INFO] [stderr]    Compiling openssl-sys v0.9.15
[INFO] [stderr]    Compiling cmake v0.1.24
[INFO] [stderr]    Compiling libz-sys v1.0.16
[INFO] [stderr]    Compiling curl-sys v0.3.14
[INFO] [stderr]    Compiling libssh2-sys v0.2.6
[INFO] [stderr]    Compiling libgit2-sys v0.6.12
[INFO] [stderr]    Compiling git2 v0.6.6
[INFO] [stderr]    Compiling next_version v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3m 49s
[INFO] running `"docker" "inspect" "6e2e569a33e3e0642a8d8101c8d380bc8a760715bceb6cc530b19784b08cade0"`
[INFO] running `"docker" "rm" "-f" "6e2e569a33e3e0642a8d8101c8d380bc8a760715bceb6cc530b19784b08cade0"`
[INFO] [stdout] 6e2e569a33e3e0642a8d8101c8d380bc8a760715bceb6cc530b19784b08cade0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/prewk/next_version:/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] 1327cfd761151a9fb9944f9d40745c0efb3ec425ac198a2972d0c31a048576b0
[INFO] running `"docker" "start" "-a" "1327cfd761151a9fb9944f9d40745c0efb3ec425ac198a2972d0c31a048576b0"`
[INFO] [stderr]    Compiling next_version v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.60s
[INFO] running `"docker" "inspect" "1327cfd761151a9fb9944f9d40745c0efb3ec425ac198a2972d0c31a048576b0"`
[INFO] running `"docker" "rm" "-f" "1327cfd761151a9fb9944f9d40745c0efb3ec425ac198a2972d0c31a048576b0"`
[INFO] [stdout] 1327cfd761151a9fb9944f9d40745c0efb3ec425ac198a2972d0c31a048576b0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/prewk/next_version:/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] a880bcb7e7b8f01cefa8c2de94e7125f841e94bcdb66c575fb91ae8eb67a81aa
[INFO] running `"docker" "start" "-a" "a880bcb7e7b8f01cefa8c2de94e7125f841e94bcdb66c575fb91ae8eb67a81aa"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/next_version-e800c7869786f19b
[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" "a880bcb7e7b8f01cefa8c2de94e7125f841e94bcdb66c575fb91ae8eb67a81aa"`
[INFO] running `"docker" "rm" "-f" "a880bcb7e7b8f01cefa8c2de94e7125f841e94bcdb66c575fb91ae8eb67a81aa"`
[INFO] [stdout] a880bcb7e7b8f01cefa8c2de94e7125f841e94bcdb66c575fb91ae8eb67a81aa