[INFO] updating cached repository TinyBuilder/rust-practice
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/TinyBuilder/rust-practice
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/TinyBuilder/rust-practice" "work/ex/beta-1.38-1/sources/1.37.0/gh/TinyBuilder/rust-practice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/TinyBuilder/rust-practice'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/TinyBuilder/rust-practice" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/TinyBuilder/rust-practice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/TinyBuilder/rust-practice'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b4015aefeda896c4cfca8720c794334a3501c48b
[INFO] sha for GitHub repo TinyBuilder/rust-practice: b4015aefeda896c4cfca8720c794334a3501c48b
[INFO] validating manifest of TinyBuilder/rust-practice 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 TinyBuilder/rust-practice 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 TinyBuilder/rust-practice
[INFO] finished frobbing TinyBuilder/rust-practice
[INFO] frobbed toml for TinyBuilder/rust-practice written to work/ex/beta-1.38-1/sources/1.37.0/gh/TinyBuilder/rust-practice/Cargo.toml
[INFO] started frobbing TinyBuilder/rust-practice
[INFO] finished frobbing TinyBuilder/rust-practice
[INFO] frobbed toml for TinyBuilder/rust-practice written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/TinyBuilder/rust-practice/Cargo.toml
[INFO] crate TinyBuilder/rust-practice 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing TinyBuilder/rust-practice 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-3/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/TinyBuilder/rust-practice:/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] eb93eeff302f93c4c65793b614033519189ecd2b092d6e363f4a43096ef54e77
[INFO] running `"docker" "start" "-a" "eb93eeff302f93c4c65793b614033519189ecd2b092d6e363f4a43096ef54e77"`
[INFO] [stderr]    Compiling unsafe-any v0.4.1
[INFO] [stderr]    Compiling mime v0.2.3
[INFO] [stderr]    Compiling conduit-mime-types v0.7.3
[INFO] [stderr]    Compiling error v0.1.9
[INFO] [stderr]    Compiling idna v0.1.1
[INFO] [stderr]    Compiling hyper v0.10.9
[INFO] [stderr]    Compiling unicase v1.4.0
[INFO] [stderr]    Compiling typemap v0.3.3
[INFO] [stderr]    Compiling plugin v0.2.6
[INFO] [stderr]    Compiling url v1.4.0
[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-1.4.0/src/form_urlencoded.rs:246:40
[INFO] [stderr]     |
[INFO] [stderr] 244 | impl<'a> Target for ::UrlQuery<'a> {
[INFO] [stderr]     |      -- lifetime `'a` defined here
[INFO] [stderr] 245 |     fn as_mut_string(&mut self) -> &mut String { &mut self.url.serialization }
[INFO] [stderr] 246 |     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 iron v0.5.1
[INFO] [stderr]    Compiling server v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 18.05s
[INFO] running `"docker" "inspect" "eb93eeff302f93c4c65793b614033519189ecd2b092d6e363f4a43096ef54e77"`
[INFO] running `"docker" "rm" "-f" "eb93eeff302f93c4c65793b614033519189ecd2b092d6e363f4a43096ef54e77"`
[INFO] [stdout] eb93eeff302f93c4c65793b614033519189ecd2b092d6e363f4a43096ef54e77
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/TinyBuilder/rust-practice:/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] b8fed2676394067eb089cf63ba3ffcfdf06c79ae717b9b6ea032922faf66ab70
[INFO] running `"docker" "start" "-a" "b8fed2676394067eb089cf63ba3ffcfdf06c79ae717b9b6ea032922faf66ab70"`
[INFO] [stderr]    Compiling server v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.11s
[INFO] running `"docker" "inspect" "b8fed2676394067eb089cf63ba3ffcfdf06c79ae717b9b6ea032922faf66ab70"`
[INFO] running `"docker" "rm" "-f" "b8fed2676394067eb089cf63ba3ffcfdf06c79ae717b9b6ea032922faf66ab70"`
[INFO] [stdout] b8fed2676394067eb089cf63ba3ffcfdf06c79ae717b9b6ea032922faf66ab70
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/TinyBuilder/rust-practice:/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] 615c4100f253b88b281fa1ce2b892ec9d00444e7fb8828b03327fc6ab4f5b533
[INFO] running `"docker" "start" "-a" "615c4100f253b88b281fa1ce2b892ec9d00444e7fb8828b03327fc6ab4f5b533"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/server-1f52ac50405e194d
[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" "615c4100f253b88b281fa1ce2b892ec9d00444e7fb8828b03327fc6ab4f5b533"`
[INFO] running `"docker" "rm" "-f" "615c4100f253b88b281fa1ce2b892ec9d00444e7fb8828b03327fc6ab4f5b533"`
[INFO] [stdout] 615c4100f253b88b281fa1ce2b892ec9d00444e7fb8828b03327fc6ab4f5b533