[INFO] updating cached repository aduric/seen
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aduric/seen
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aduric/seen" "work/ex/beta-1.38-1/sources/1.37.0/gh/aduric/seen"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/aduric/seen'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aduric/seen" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aduric/seen"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aduric/seen'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e8d05543003996af7d06af362f7a59e1f883f438
[INFO] sha for GitHub repo aduric/seen: e8d05543003996af7d06af362f7a59e1f883f438
[INFO] validating manifest of aduric/seen 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 aduric/seen 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 aduric/seen
[INFO] finished frobbing aduric/seen
[INFO] frobbed toml for aduric/seen written to work/ex/beta-1.38-1/sources/1.37.0/gh/aduric/seen/Cargo.toml
[INFO] started frobbing aduric/seen
[INFO] finished frobbing aduric/seen
[INFO] frobbed toml for aduric/seen written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aduric/seen/Cargo.toml
[INFO] crate aduric/seen 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 aduric/seen 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/aduric/seen:/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] 98f8187555c40b752d980fc4a5fcbe363ffeeeea3d2ccc2925600155113a307a
[INFO] running `"docker" "start" "-a" "98f8187555c40b752d980fc4a5fcbe363ffeeeea3d2ccc2925600155113a307a"`
[INFO] [stderr]    Compiling lazy_static v0.2.9
[INFO] [stderr]    Compiling serde v1.0.18
[INFO] [stderr]    Compiling graffiti v0.1.0 (https://github.com/aduric/graffiti.git#0cf56627)
[INFO] [stderr]    Compiling time v0.1.38
[INFO] [stderr]    Compiling num_cpus v1.7.0
[INFO] [stderr]    Compiling error v0.1.9
[INFO] [stderr]    Compiling conduit-mime-types v0.7.3
[INFO] [stderr]    Compiling url v1.6.0
[INFO] [stderr]    Compiling serde_derive_internals v0.16.0
[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-1.6.0/src/form_urlencoded.rs:261:40
[INFO] [stderr]     |
[INFO] [stderr] 259 | impl<'a> Target for ::UrlQuery<'a> {
[INFO] [stderr]     |      -- lifetime `'a` defined here
[INFO] [stderr] 260 |     fn as_mut_string(&mut self) -> &mut String { &mut self.url.serialization }
[INFO] [stderr] 261 |     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 serde_derive v1.0.18
[INFO] [stderr]    Compiling hyper v0.10.13
[INFO] [stderr]    Compiling iron v0.5.1
[INFO] [stderr]    Compiling persistent v0.3.0
[INFO] [stderr]    Compiling serde_json v1.0.5
[INFO] [stderr]    Compiling bodyparser v0.7.0 (https://github.com/iron/body-parser.git#bb1c2286)
[INFO] [stderr]    Compiling seen v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: expected item, found keyword `let`
[INFO] [stderr]   --> src/main.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | let tokens: &'static str = 
[INFO] [stderr]    | ^^^ expected item
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `seen`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "98f8187555c40b752d980fc4a5fcbe363ffeeeea3d2ccc2925600155113a307a"`
[INFO] running `"docker" "rm" "-f" "98f8187555c40b752d980fc4a5fcbe363ffeeeea3d2ccc2925600155113a307a"`
[INFO] [stdout] 98f8187555c40b752d980fc4a5fcbe363ffeeeea3d2ccc2925600155113a307a