[INFO] updating cached repository madadam/rust-async-experiments [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/madadam/rust-async-experiments [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/madadam/rust-async-experiments" "work/ex/beta-1.38-1/sources/1.37.0/gh/madadam/rust-async-experiments"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/madadam/rust-async-experiments'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/madadam/rust-async-experiments" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/madadam/rust-async-experiments"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/madadam/rust-async-experiments'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 6e420cfbc4852492603239c1fa08ddd827cbe6d6 [INFO] sha for GitHub repo madadam/rust-async-experiments: 6e420cfbc4852492603239c1fa08ddd827cbe6d6 [INFO] validating manifest of madadam/rust-async-experiments 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 madadam/rust-async-experiments 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 madadam/rust-async-experiments [INFO] finished frobbing madadam/rust-async-experiments [INFO] frobbed toml for madadam/rust-async-experiments written to work/ex/beta-1.38-1/sources/1.37.0/gh/madadam/rust-async-experiments/Cargo.toml [INFO] started frobbing madadam/rust-async-experiments [INFO] finished frobbing madadam/rust-async-experiments [INFO] frobbed toml for madadam/rust-async-experiments written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/madadam/rust-async-experiments/Cargo.toml [INFO] crate madadam/rust-async-experiments 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 madadam/rust-async-experiments 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/madadam/rust-async-experiments:/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] d1904e23bec7dd75a7b6de82650696f7ca7d40435c7b81d44077de7ac293abec [INFO] running `"docker" "start" "-a" "d1904e23bec7dd75a7b6de82650696f7ca7d40435c7b81d44077de7ac293abec"` [INFO] [stderr] Compiling rustc-serialize v0.3.19 [INFO] [stderr] Compiling net2 v0.2.26 [INFO] [stderr] Compiling nix v0.5.1 [INFO] [stderr] Compiling futures v0.1.1 (https://github.com/alexcrichton/futures-rs#59de7fe6) [INFO] [stderr] Compiling humantime v0.1.3 [INFO] [stderr] Compiling toml v0.1.30 [INFO] [stderr] Compiling url v1.2.1 [INFO] [stderr] Compiling ordered-float v0.1.0 [INFO] [stderr] error[E0642]: patterns aren't allowed in methods without bodies [INFO] [stderr] --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-serialize-0.3.19/src/serialize.rs:147:45 [INFO] [stderr] | [INFO] [stderr] 147 | &f_name: &str, [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] Compiling fs2 v0.2.5 [INFO] [stderr] Compiling serde-value v0.2.1 [INFO] [stderr] Compiling chrono v0.2.25 [INFO] [stderr] Compiling miow v0.1.3 [INFO] [stderr] Compiling regex v0.1.77 [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-1.2.1/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] error: aborting due to previous error [INFO] [stderr] [INFO] [stderr] For more information about this error, try `rustc --explain E0642`. [INFO] [stderr] error: Could not compile `rustc-serialize`. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] error: build failed [INFO] running `"docker" "inspect" "d1904e23bec7dd75a7b6de82650696f7ca7d40435c7b81d44077de7ac293abec"` [INFO] running `"docker" "rm" "-f" "d1904e23bec7dd75a7b6de82650696f7ca7d40435c7b81d44077de7ac293abec"` [INFO] [stdout] d1904e23bec7dd75a7b6de82650696f7ca7d40435c7b81d44077de7ac293abec