[INFO] updating cached repository amazingmo/Basics
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/amazingmo/Basics
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/amazingmo/Basics" "work/ex/beta-1.38-1/sources/1.37.0/gh/amazingmo/Basics"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/amazingmo/Basics'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/amazingmo/Basics" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/amazingmo/Basics"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/amazingmo/Basics'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a8c4f50b81a384f001af242baa3affc9e6d169ad
[INFO] sha for GitHub repo amazingmo/Basics: a8c4f50b81a384f001af242baa3affc9e6d169ad
[INFO] validating manifest of amazingmo/Basics 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 amazingmo/Basics 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 amazingmo/Basics
[INFO] finished frobbing amazingmo/Basics
[INFO] frobbed toml for amazingmo/Basics written to work/ex/beta-1.38-1/sources/1.37.0/gh/amazingmo/Basics/Cargo.toml
[INFO] started frobbing amazingmo/Basics
[INFO] finished frobbing amazingmo/Basics
[INFO] frobbed toml for amazingmo/Basics written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/amazingmo/Basics/Cargo.toml
[INFO] crate amazingmo/Basics 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 amazingmo/Basics 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/amazingmo/Basics:/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] 6dd6a96685098960ebd78470a5042f279a7414882e11ba06c4222665916372b4
[INFO] running `"docker" "start" "-a" "6dd6a96685098960ebd78470a5042f279a7414882e11ba06c4222665916372b4"`
[INFO] [stderr]    Compiling version_check v0.1.3
[INFO] [stderr]    Compiling matches v0.1.6
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.5
[INFO] [stderr]    Compiling libc v0.2.36
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]    Compiling httparse v1.2.4
[INFO] [stderr]    Compiling modifier v0.1.0
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling num-traits v0.1.42
[INFO] [stderr]    Compiling dtoa v0.2.2
[INFO] [stderr]    Compiling itoa v0.1.1
[INFO] [stderr]    Compiling route-recognizer v0.1.12
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling base64 v0.6.0
[INFO] [stderr]    Compiling conduit-mime-types v0.7.3
[INFO] [stderr]    Compiling unsafe-any v0.4.2
[INFO] [stderr]    Compiling error v0.1.9
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling time v0.1.39
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling typemap v0.3.3
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling plugin v0.2.6
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling idna v0.1.4
[INFO] [stderr]    Compiling url v1.6.0
[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_json v0.8.6
[INFO] [stderr]    Compiling hyper v0.10.13
[INFO] [stderr]    Compiling iron v0.5.1
[INFO] [stderr]    Compiling persistent v0.3.0
[INFO] [stderr]    Compiling router v0.5.1
[INFO] [stderr]    Compiling bodyparser v0.5.0
[INFO] [stderr]    Compiling urlencoded v0.5.0
[INFO] [stderr]    Compiling chapter1 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/main.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | #[macro_use] extern crate mime;
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `iron::prelude::*`
[INFO] [stderr]   --> src/main.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | use iron::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `iron::status`
[INFO] [stderr]   --> src/main.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | use iron::status;
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 32.99s
[INFO] running `"docker" "inspect" "6dd6a96685098960ebd78470a5042f279a7414882e11ba06c4222665916372b4"`
[INFO] running `"docker" "rm" "-f" "6dd6a96685098960ebd78470a5042f279a7414882e11ba06c4222665916372b4"`
[INFO] [stdout] 6dd6a96685098960ebd78470a5042f279a7414882e11ba06c4222665916372b4
[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/amazingmo/Basics:/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] 4e8cf31b002a6d31aee64f084848cea74619504daad93adbfaad7c9f12c3576f
[INFO] running `"docker" "start" "-a" "4e8cf31b002a6d31aee64f084848cea74619504daad93adbfaad7c9f12c3576f"`
[INFO] [stderr]    Compiling chapter1 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/main.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | #[macro_use] extern crate mime;
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `iron::prelude::*`
[INFO] [stderr]   --> src/main.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | use iron::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `iron::status`
[INFO] [stderr]   --> src/main.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | use iron::status;
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.28s
[INFO] running `"docker" "inspect" "4e8cf31b002a6d31aee64f084848cea74619504daad93adbfaad7c9f12c3576f"`
[INFO] running `"docker" "rm" "-f" "4e8cf31b002a6d31aee64f084848cea74619504daad93adbfaad7c9f12c3576f"`
[INFO] [stdout] 4e8cf31b002a6d31aee64f084848cea74619504daad93adbfaad7c9f12c3576f
[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/amazingmo/Basics:/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] 317f87fb7b574ffd88f6b2ca266e387b49f573cfeb4919559945aa3226aa9da9
[INFO] running `"docker" "start" "-a" "317f87fb7b574ffd88f6b2ca266e387b49f573cfeb4919559945aa3226aa9da9"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chapter1-eb1a266e107b8223
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_gcd ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "317f87fb7b574ffd88f6b2ca266e387b49f573cfeb4919559945aa3226aa9da9"`
[INFO] running `"docker" "rm" "-f" "317f87fb7b574ffd88f6b2ca266e387b49f573cfeb4919559945aa3226aa9da9"`
[INFO] [stdout] 317f87fb7b574ffd88f6b2ca266e387b49f573cfeb4919559945aa3226aa9da9