[INFO] updating cached repository christian-blades-cb/nexttrain
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/christian-blades-cb/nexttrain
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/christian-blades-cb/nexttrain" "work/ex/beta-1.38-1/sources/1.37.0/gh/christian-blades-cb/nexttrain"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/christian-blades-cb/nexttrain'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/christian-blades-cb/nexttrain" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/christian-blades-cb/nexttrain"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/christian-blades-cb/nexttrain'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a06757553203790ae7043c4e8559102293697aae
[INFO] sha for GitHub repo christian-blades-cb/nexttrain: a06757553203790ae7043c4e8559102293697aae
[INFO] validating manifest of christian-blades-cb/nexttrain 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 christian-blades-cb/nexttrain 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 christian-blades-cb/nexttrain
[INFO] finished frobbing christian-blades-cb/nexttrain
[INFO] frobbed toml for christian-blades-cb/nexttrain written to work/ex/beta-1.38-1/sources/1.37.0/gh/christian-blades-cb/nexttrain/Cargo.toml
[INFO] started frobbing christian-blades-cb/nexttrain
[INFO] finished frobbing christian-blades-cb/nexttrain
[INFO] frobbed toml for christian-blades-cb/nexttrain written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/christian-blades-cb/nexttrain/Cargo.toml
[INFO] crate christian-blades-cb/nexttrain 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 christian-blades-cb/nexttrain 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/christian-blades-cb/nexttrain:/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] 50acdb1ced4ab50e0b8740cca780b3f53407661fc79b37681f30e24524a73857
[INFO] running `"docker" "start" "-a" "50acdb1ced4ab50e0b8740cca780b3f53407661fc79b37681f30e24524a73857"`
[INFO] [stderr]    Compiling num_cpus v1.2.1
[INFO] [stderr]    Compiling url v1.3.0
[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-1.3.0/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 hyper v0.10.0
[INFO] [stderr]    Compiling nexttrain v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `clone`
[INFO] [stderr]  --> src/main.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::{env,clone};
[INFO] [stderr]   |               ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.76s
[INFO] running `"docker" "inspect" "50acdb1ced4ab50e0b8740cca780b3f53407661fc79b37681f30e24524a73857"`
[INFO] running `"docker" "rm" "-f" "50acdb1ced4ab50e0b8740cca780b3f53407661fc79b37681f30e24524a73857"`
[INFO] [stdout] 50acdb1ced4ab50e0b8740cca780b3f53407661fc79b37681f30e24524a73857
[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/christian-blades-cb/nexttrain:/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] 8a0847ee3f88f7ff3aad3d2846453a88ccb63d433facff7ac23abe41001c90e5
[INFO] running `"docker" "start" "-a" "8a0847ee3f88f7ff3aad3d2846453a88ccb63d433facff7ac23abe41001c90e5"`
[INFO] [stderr]    Compiling nexttrain v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `clone`
[INFO] [stderr]  --> src/main.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::{env,clone};
[INFO] [stderr]   |               ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.90s
[INFO] running `"docker" "inspect" "8a0847ee3f88f7ff3aad3d2846453a88ccb63d433facff7ac23abe41001c90e5"`
[INFO] running `"docker" "rm" "-f" "8a0847ee3f88f7ff3aad3d2846453a88ccb63d433facff7ac23abe41001c90e5"`
[INFO] [stdout] 8a0847ee3f88f7ff3aad3d2846453a88ccb63d433facff7ac23abe41001c90e5
[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/christian-blades-cb/nexttrain:/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] 627d23839a3aeece7b7d71f0362a00ce10c8d505549bf2a5cd41018447511411
[INFO] running `"docker" "start" "-a" "627d23839a3aeece7b7d71f0362a00ce10c8d505549bf2a5cd41018447511411"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/nexttrain-c4332545bb88cdc7
[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" "627d23839a3aeece7b7d71f0362a00ce10c8d505549bf2a5cd41018447511411"`
[INFO] running `"docker" "rm" "-f" "627d23839a3aeece7b7d71f0362a00ce10c8d505549bf2a5cd41018447511411"`
[INFO] [stdout] 627d23839a3aeece7b7d71f0362a00ce10c8d505549bf2a5cd41018447511411