[INFO] updating cached repository calavera/flake
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/calavera/flake
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/calavera/flake" "work/ex/beta-1.38-1/sources/1.37.0/gh/calavera/flake"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/calavera/flake'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/calavera/flake" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/calavera/flake"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/calavera/flake'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a6f178d1c9ac498a43afb22114e34455a5b393f1
[INFO] sha for GitHub repo calavera/flake: a6f178d1c9ac498a43afb22114e34455a5b393f1
[INFO] validating manifest of calavera/flake 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 calavera/flake 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 calavera/flake
[INFO] finished frobbing calavera/flake
[INFO] frobbed toml for calavera/flake written to work/ex/beta-1.38-1/sources/1.37.0/gh/calavera/flake/Cargo.toml
[INFO] started frobbing calavera/flake
[INFO] finished frobbing calavera/flake
[INFO] frobbed toml for calavera/flake written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/calavera/flake/Cargo.toml
[INFO] crate calavera/flake 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 calavera/flake 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/calavera/flake:/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] c77cf24af6f545be58d600120807907e1bf206bffa945163866be7fecbacd3e5
[INFO] running `"docker" "start" "-a" "c77cf24af6f545be58d600120807907e1bf206bffa945163866be7fecbacd3e5"`
[INFO] [stderr]    Compiling gcc v0.3.39
[INFO] [stderr]    Compiling openssl-probe v0.1.0
[INFO] [stderr]    Compiling openssl-sys v0.9.3
[INFO] [stderr]    Compiling rust-gmp v0.2.10
[INFO] [stderr]    Compiling dbus v0.2.3
[INFO] [stderr]    Compiling schedule_recv v0.1.0
[INFO] [stderr]    Compiling clap v2.19.2
[INFO] [stderr]    Compiling url v1.2.3
[INFO] [stderr]    Compiling time v0.1.35
[INFO] [stderr] error: type `rand::gmp_randstate_struct` is private
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rust-gmp-0.2.10/src/mpz.rs:90:45
[INFO] [stderr]    |
[INFO] [stderr] 90 |     fn __gmpz_urandomb(rop: mpz_ptr, state: gmp_randstate_t, n: mp_bitcnt_t);
[INFO] [stderr]    |                                             ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: type `rand::gmp_randstate_struct` is private
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rust-gmp-0.2.10/src/mpz.rs:91:45
[INFO] [stderr]    |
[INFO] [stderr] 91 |     fn __gmpz_urandomm(rop: mpz_ptr, state: gmp_randstate_t, n: mpz_srcptr);
[INFO] [stderr]    |                                             ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust-gmp`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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-1.2.3/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: build failed
[INFO] running `"docker" "inspect" "c77cf24af6f545be58d600120807907e1bf206bffa945163866be7fecbacd3e5"`
[INFO] running `"docker" "rm" "-f" "c77cf24af6f545be58d600120807907e1bf206bffa945163866be7fecbacd3e5"`
[INFO] [stdout] c77cf24af6f545be58d600120807907e1bf206bffa945163866be7fecbacd3e5