[INFO] updating cached repository hexium310/twitter-for-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/hexium310/twitter-for-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/hexium310/twitter-for-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/hexium310/twitter-for-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/hexium310/twitter-for-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/hexium310/twitter-for-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hexium310/twitter-for-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hexium310/twitter-for-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 966619122f3c6e62f582c1ff16f0bcbb7f5e9023
[INFO] sha for GitHub repo hexium310/twitter-for-rust: 966619122f3c6e62f582c1ff16f0bcbb7f5e9023
[INFO] validating manifest of hexium310/twitter-for-rust 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 hexium310/twitter-for-rust 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 hexium310/twitter-for-rust
[INFO] finished frobbing hexium310/twitter-for-rust
[INFO] frobbed toml for hexium310/twitter-for-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/hexium310/twitter-for-rust/Cargo.toml
[INFO] started frobbing hexium310/twitter-for-rust
[INFO] finished frobbing hexium310/twitter-for-rust
[INFO] frobbed toml for hexium310/twitter-for-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hexium310/twitter-for-rust/Cargo.toml
[INFO] crate hexium310/twitter-for-rust 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] testing hexium310/twitter-for-rust 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-2/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/hexium310/twitter-for-rust:/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] 65b80f2c1689bf48a64861319b3c48ba41c48f34c800bc4ff7ec38c9bac54fe5
[INFO] running `"docker" "start" "-a" "65b80f2c1689bf48a64861319b3c48ba41c48f34c800bc4ff7ec38c9bac54fe5"`
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling unicode-bidi v0.3.3
[INFO] [stderr]    Compiling hyper v0.10.11
[INFO] [stderr]    Compiling idna v0.1.2
[INFO] [stderr]    Compiling url v1.4.1
[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-1.4.1/src/form_urlencoded.rs:248:40
[INFO] [stderr]     |
[INFO] [stderr] 246 | impl<'a> Target for ::UrlQuery<'a> {
[INFO] [stderr]     |      -- lifetime `'a` defined here
[INFO] [stderr] 247 |     fn as_mut_string(&mut self) -> &mut String { &mut self.url.serialization }
[INFO] [stderr] 248 |     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-native-tls v0.2.3
[INFO] [stderr]    Compiling twitter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.98s
[INFO] running `"docker" "inspect" "65b80f2c1689bf48a64861319b3c48ba41c48f34c800bc4ff7ec38c9bac54fe5"`
[INFO] running `"docker" "rm" "-f" "65b80f2c1689bf48a64861319b3c48ba41c48f34c800bc4ff7ec38c9bac54fe5"`
[INFO] [stdout] 65b80f2c1689bf48a64861319b3c48ba41c48f34c800bc4ff7ec38c9bac54fe5
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/hexium310/twitter-for-rust:/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] ac7d3c13998aee25b5cb271b7d6dbcbed0f5f16969e989f04ae5c24c3149f27f
[INFO] running `"docker" "start" "-a" "ac7d3c13998aee25b5cb271b7d6dbcbed0f5f16969e989f04ae5c24c3149f27f"`
[INFO] [stderr]    Compiling twitter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "ac7d3c13998aee25b5cb271b7d6dbcbed0f5f16969e989f04ae5c24c3149f27f"`
[INFO] running `"docker" "rm" "-f" "ac7d3c13998aee25b5cb271b7d6dbcbed0f5f16969e989f04ae5c24c3149f27f"`
[INFO] [stdout] ac7d3c13998aee25b5cb271b7d6dbcbed0f5f16969e989f04ae5c24c3149f27f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/hexium310/twitter-for-rust:/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] 9ae7d9e9665caad7e258dfbbf3becf4a869bdcf7b5172f4e10214c4433f6154f
[INFO] running `"docker" "start" "-a" "9ae7d9e9665caad7e258dfbbf3becf4a869bdcf7b5172f4e10214c4433f6154f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/twitter-270ad62ba02522a1
[INFO] [stderr]    Doc-tests twitter
[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] running `"docker" "inspect" "9ae7d9e9665caad7e258dfbbf3becf4a869bdcf7b5172f4e10214c4433f6154f"`
[INFO] running `"docker" "rm" "-f" "9ae7d9e9665caad7e258dfbbf3becf4a869bdcf7b5172f4e10214c4433f6154f"`
[INFO] [stdout] 9ae7d9e9665caad7e258dfbbf3becf4a869bdcf7b5172f4e10214c4433f6154f