[INFO] updating cached repository bstrydo/xconf
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bstrydo/xconf
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bstrydo/xconf" "work/ex/beta-1.37-6/sources/1.36.0/gh/bstrydo/xconf"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/bstrydo/xconf'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bstrydo/xconf" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bstrydo/xconf"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bstrydo/xconf'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1ab32ad4d6e1445ed7f04c3050400f90cca067d3
[INFO] sha for GitHub repo bstrydo/xconf: 1ab32ad4d6e1445ed7f04c3050400f90cca067d3
[INFO] validating manifest of bstrydo/xconf on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bstrydo/xconf on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bstrydo/xconf
[INFO] finished frobbing bstrydo/xconf
[INFO] frobbed toml for bstrydo/xconf written to work/ex/beta-1.37-6/sources/1.36.0/gh/bstrydo/xconf/Cargo.toml
[INFO] started frobbing bstrydo/xconf
[INFO] finished frobbing bstrydo/xconf
[INFO] frobbed toml for bstrydo/xconf written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bstrydo/xconf/Cargo.toml
[INFO] crate bstrydo/xconf already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing bstrydo/xconf against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bstrydo/xconf:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 3fc0e32ec23e60cebe8ed85a37ff7f1008b1bfab0c1dd349a15c0e7df87e71b2
[INFO] running `"docker" "start" "-a" "3fc0e32ec23e60cebe8ed85a37ff7f1008b1bfab0c1dd349a15c0e7df87e71b2"`
[INFO] [stderr]    Compiling idna v0.1.2
[INFO] [stderr]    Compiling url v1.5.1
[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 hyper v0.10.12
[INFO] [stderr]    Compiling iron v0.5.1
[INFO] [stderr]    Compiling router v0.5.1
[INFO] [stderr]    Compiling xconf v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable `weird` is assigned to, but never used
[INFO] [stderr]   --> src/bin/lifetimes.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let weird; //starts living here
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr]    = note: consider using `_weird` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `weird` is never read
[INFO] [stderr]   --> src/bin/lifetimes.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         weird = do_something_weird(&my_v1, 3, my_v2);
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/thread_example.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut handles = vec![
[INFO] [stderr]    |         ----^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/thread_example.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         handle.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 26.33s
[INFO] running `"docker" "inspect" "3fc0e32ec23e60cebe8ed85a37ff7f1008b1bfab0c1dd349a15c0e7df87e71b2"`
[INFO] running `"docker" "rm" "-f" "3fc0e32ec23e60cebe8ed85a37ff7f1008b1bfab0c1dd349a15c0e7df87e71b2"`
[INFO] [stdout] 3fc0e32ec23e60cebe8ed85a37ff7f1008b1bfab0c1dd349a15c0e7df87e71b2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bstrydo/xconf:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] ae85d99f6f094217222e74d33801169dedcfeadf06fc5e4a5f4bcc9fffed018d
[INFO] running `"docker" "start" "-a" "ae85d99f6f094217222e74d33801169dedcfeadf06fc5e4a5f4bcc9fffed018d"`
[INFO] [stderr]    Compiling xconf v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/thread_example.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let mut handles = vec![
[INFO] [stderr]    |         ----^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/thread_example.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         handle.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable `weird` is assigned to, but never used
[INFO] [stderr]   --> src/bin/lifetimes.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let weird; //starts living here
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr]    = note: consider using `_weird` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `weird` is never read
[INFO] [stderr]   --> src/bin/lifetimes.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         weird = do_something_weird(&my_v1, 3, my_v2);
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.36s
[INFO] running `"docker" "inspect" "ae85d99f6f094217222e74d33801169dedcfeadf06fc5e4a5f4bcc9fffed018d"`
[INFO] running `"docker" "rm" "-f" "ae85d99f6f094217222e74d33801169dedcfeadf06fc5e4a5f4bcc9fffed018d"`
[INFO] [stdout] ae85d99f6f094217222e74d33801169dedcfeadf06fc5e4a5f4bcc9fffed018d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bstrydo/xconf:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 6e058e5b88c9fa0b93acdf7a2fd496f49207f15a62702b8ddd7e3f959030704f
[INFO] running `"docker" "start" "-a" "6e058e5b88c9fa0b93acdf7a2fd496f49207f15a62702b8ddd7e3f959030704f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/bad_cycle-ceb4f93deae3ae16
[INFO] [stderr]      Running /opt/crater/target/debug/deps/factorial-a5e15f6decb767bb
[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] [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] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/lifetimes-97b8a3db46881f64
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rest-2ecb75221293e214
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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] [stderr]      Running /opt/crater/target/debug/deps/safe_cycle-e56091d62924ff97
[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] [stderr]      Running /opt/crater/target/debug/deps/thread_example-f0dd2b3fdd19f9a2
[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] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/xconf-f996c020fe2dbd0d
[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" "6e058e5b88c9fa0b93acdf7a2fd496f49207f15a62702b8ddd7e3f959030704f"`
[INFO] running `"docker" "rm" "-f" "6e058e5b88c9fa0b93acdf7a2fd496f49207f15a62702b8ddd7e3f959030704f"`
[INFO] [stdout] 6e058e5b88c9fa0b93acdf7a2fd496f49207f15a62702b8ddd7e3f959030704f