[INFO] updating cached repository cruessler/git-tree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cruessler/git-tree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cruessler/git-tree" "work/ex/beta-1.38-1/sources/1.37.0/gh/cruessler/git-tree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cruessler/git-tree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cruessler/git-tree" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cruessler/git-tree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cruessler/git-tree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1f4c729332f170ed93abbf61d741f9f49f2db48b
[INFO] sha for GitHub repo cruessler/git-tree: 1f4c729332f170ed93abbf61d741f9f49f2db48b
[INFO] validating manifest of cruessler/git-tree 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 cruessler/git-tree 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 cruessler/git-tree
[INFO] finished frobbing cruessler/git-tree
[INFO] frobbed toml for cruessler/git-tree written to work/ex/beta-1.38-1/sources/1.37.0/gh/cruessler/git-tree/Cargo.toml
[INFO] started frobbing cruessler/git-tree
[INFO] finished frobbing cruessler/git-tree
[INFO] frobbed toml for cruessler/git-tree written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cruessler/git-tree/Cargo.toml
[INFO] crate cruessler/git-tree 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 cruessler/git-tree 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-0/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/cruessler/git-tree:/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] 6b77bb01fbe34c957e563293ea6da4056e3c4189465bbf049fdb09b65be0fd9f
[INFO] running `"docker" "start" "-a" "6b77bb01fbe34c957e563293ea6da4056e3c4189465bbf049fdb09b65be0fd9f"`
[INFO] [stderr]    Compiling libc v0.2.30
[INFO] [stderr]    Compiling ansi_term v0.10.1
[INFO] [stderr]    Compiling cmake v0.1.25
[INFO] [stderr]    Compiling url v1.5.1
[INFO] [stderr]    Compiling libssh2-sys v0.2.6
[INFO] [stderr]    Compiling libgit2-sys v0.6.14
[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]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]    Compiling openssl-sys v0.9.17
[INFO] [stderr]    Compiling libz-sys v1.0.16
[INFO] [stderr]    Compiling term_size v0.3.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling atty v0.2.2
[INFO] [stderr]    Compiling backtrace v0.3.5
[INFO] [stderr]    Compiling textwrap v0.8.0
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling curl-sys v0.3.14
[INFO] [stderr]    Compiling clap v2.26.2
[INFO] [stderr]    Compiling git2 v0.6.8
[INFO] [stderr]    Compiling git-tree v0.1.3 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 09s
[INFO] running `"docker" "inspect" "6b77bb01fbe34c957e563293ea6da4056e3c4189465bbf049fdb09b65be0fd9f"`
[INFO] running `"docker" "rm" "-f" "6b77bb01fbe34c957e563293ea6da4056e3c4189465bbf049fdb09b65be0fd9f"`
[INFO] [stdout] 6b77bb01fbe34c957e563293ea6da4056e3c4189465bbf049fdb09b65be0fd9f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/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/cruessler/git-tree:/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] e5d95dfe868a73fa9301b2a4e2de6c00471278c2af54a660b46d3532d02281d9
[INFO] running `"docker" "start" "-a" "e5d95dfe868a73fa9301b2a4e2de6c00471278c2af54a660b46d3532d02281d9"`
[INFO] [stderr]    Compiling git-tree v0.1.3 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `"docker" "inspect" "e5d95dfe868a73fa9301b2a4e2de6c00471278c2af54a660b46d3532d02281d9"`
[INFO] running `"docker" "rm" "-f" "e5d95dfe868a73fa9301b2a4e2de6c00471278c2af54a660b46d3532d02281d9"`
[INFO] [stdout] e5d95dfe868a73fa9301b2a4e2de6c00471278c2af54a660b46d3532d02281d9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/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/cruessler/git-tree:/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] 6d17546bfba4e941c69c1b5ae366a228fe90296c8d01549f65d7f2cab9b8ed1b
[INFO] running `"docker" "start" "-a" "6d17546bfba4e941c69c1b5ae366a228fe90296c8d01549f65d7f2cab9b8ed1b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/git_tree-b6df08ca35d51579
[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" "6d17546bfba4e941c69c1b5ae366a228fe90296c8d01549f65d7f2cab9b8ed1b"`
[INFO] running `"docker" "rm" "-f" "6d17546bfba4e941c69c1b5ae366a228fe90296c8d01549f65d7f2cab9b8ed1b"`
[INFO] [stdout] 6d17546bfba4e941c69c1b5ae366a228fe90296c8d01549f65d7f2cab9b8ed1b