[INFO] updating cached repository wwjei/my-rustling
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/wwjei/my-rustling
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/wwjei/my-rustling" "work/ex/beta-1.38-1/sources/1.37.0/gh/wwjei/my-rustling"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/wwjei/my-rustling'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/wwjei/my-rustling" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/wwjei/my-rustling"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/wwjei/my-rustling'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8c1dbb365421a4badeec2889cbe2141cecba41e6
[INFO] sha for GitHub repo wwjei/my-rustling: 8c1dbb365421a4badeec2889cbe2141cecba41e6
[INFO] validating manifest of wwjei/my-rustling 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 wwjei/my-rustling 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 wwjei/my-rustling
[INFO] finished frobbing wwjei/my-rustling
[INFO] frobbed toml for wwjei/my-rustling written to work/ex/beta-1.38-1/sources/1.37.0/gh/wwjei/my-rustling/Cargo.toml
[INFO] started frobbing wwjei/my-rustling
[INFO] finished frobbing wwjei/my-rustling
[INFO] frobbed toml for wwjei/my-rustling written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/wwjei/my-rustling/Cargo.toml
[INFO] crate wwjei/my-rustling 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 wwjei/my-rustling 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-1/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/wwjei/my-rustling:/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] 35a0bfe77dcaf8522e7ac2ba1fb5e3231c79d9019f24e96da0504c0864504fbc
[INFO] running `"docker" "start" "-a" "35a0bfe77dcaf8522e7ac2ba1fb5e3231c79d9019f24e96da0504c0864504fbc"`
[INFO] [stderr]    Compiling libc v0.2.37
[INFO] [stderr]    Compiling num-traits v0.2.1
[INFO] [stderr]    Compiling serde v1.0.27
[INFO] [stderr]    Compiling regex-syntax v0.4.2
[INFO] [stderr]    Compiling pest_derive v1.0.6
[INFO] [stderr]    Compiling url v1.7.0
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling atty v0.2.6
[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-1.7.0/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 clap v2.30.0
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling regex v0.2.6
[INFO] [stderr]    Compiling prlink v0.1.0 (https://github.com/btbytes/prlink#f0536ed3)
[INFO] [stderr]    Compiling serde_json v1.0.10
[INFO] [stderr]    Compiling handlebars v0.32.0
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.81s
[INFO] running `"docker" "inspect" "35a0bfe77dcaf8522e7ac2ba1fb5e3231c79d9019f24e96da0504c0864504fbc"`
[INFO] running `"docker" "rm" "-f" "35a0bfe77dcaf8522e7ac2ba1fb5e3231c79d9019f24e96da0504c0864504fbc"`
[INFO] [stdout] 35a0bfe77dcaf8522e7ac2ba1fb5e3231c79d9019f24e96da0504c0864504fbc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/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/wwjei/my-rustling:/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] 4979177adf5f40e47149c9a19f1a1d21dd3098db82470e47ca3bf0a67eb2864a
[INFO] running `"docker" "start" "-a" "4979177adf5f40e47149c9a19f1a1d21dd3098db82470e47ca3bf0a67eb2864a"`
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> tests/tests4.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: unexpected end of macro invocation
[INFO] [stderr]  --> tests/tests2.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |         assert_eq!();
[INFO] [stderr]   |         ^^^^^^^^^^^^^ missing tokens in macro arguments
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rustlings`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: macro requires a boolean expression as an argument
[INFO] [stderr]   --> tests/tests1.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         assert!();
[INFO] [stderr]    |         ^^^^^^^^^^ boolean expression required
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> tests/tests3.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rustlings`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4979177adf5f40e47149c9a19f1a1d21dd3098db82470e47ca3bf0a67eb2864a"`
[INFO] running `"docker" "rm" "-f" "4979177adf5f40e47149c9a19f1a1d21dd3098db82470e47ca3bf0a67eb2864a"`
[INFO] [stdout] 4979177adf5f40e47149c9a19f1a1d21dd3098db82470e47ca3bf0a67eb2864a