[INFO] updating cached repository rusts/team
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rusts/team
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rusts/team" "work/ex/beta-1.38-1/sources/1.37.0/gh/rusts/team"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rusts/team'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rusts/team" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rusts/team"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rusts/team'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7782b892017078eff551e37057e06d5241ac90dc
[INFO] sha for GitHub repo rusts/team: 7782b892017078eff551e37057e06d5241ac90dc
[INFO] validating manifest of rusts/team 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 rusts/team 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 rusts/team
[INFO] finished frobbing rusts/team
[INFO] frobbed toml for rusts/team written to work/ex/beta-1.38-1/sources/1.37.0/gh/rusts/team/Cargo.toml
[INFO] started frobbing rusts/team
[INFO] finished frobbing rusts/team
[INFO] frobbed toml for rusts/team written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rusts/team/Cargo.toml
[INFO] crate rusts/team 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 rusts/team 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/rusts/team:/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] 4334c0861d88e3cca6ab0c2118e7898f07597a8ac7f610a9635f5eb0252ef36e
[INFO] running `"docker" "start" "-a" "4334c0861d88e3cca6ab0c2118e7898f07597a8ac7f610a9635f5eb0252ef36e"`
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]    Compiling matches v0.1.4
[INFO] [stderr]    Compiling siphasher v0.2.2
[INFO] [stderr]    Compiling unicode-normalization v0.1.4
[INFO] [stderr]    Compiling num-traits v0.1.37
[INFO] [stderr]    Compiling libc v0.2.22
[INFO] [stderr]    Compiling pkg-config v0.3.9
[INFO] [stderr]    Compiling gcc v0.3.46
[INFO] [stderr]    Compiling byteorder v1.0.0
[INFO] [stderr]    Compiling log v0.3.7
[INFO] [stderr]    Compiling cfg-if v0.1.0
[INFO] [stderr]    Compiling httparse v1.2.2
[INFO] [stderr]    Compiling futures v0.1.14
[INFO] [stderr]    Compiling lazy_static v0.2.8
[INFO] [stderr]    Compiling build_const v0.2.0
[INFO] [stderr]    Compiling openssl v0.9.12
[INFO] [stderr]    Compiling slab v0.3.0
[INFO] [stderr]    Compiling lazycell v0.4.0
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling itoa v0.1.1
[INFO] [stderr]    Compiling serde v1.0.7
[INFO] [stderr]    Compiling scoped-tls v0.1.0
[INFO] [stderr]    Compiling foreign-types v0.2.0
[INFO] [stderr]    Compiling bitflags v0.8.2
[INFO] [stderr]    Compiling md5 v0.3.4
[INFO] [stderr]    Compiling dtoa v0.2.2
[INFO] [stderr]    Compiling fallible-iterator v0.1.3
[INFO] [stderr]    Compiling hex v0.2.0
[INFO] [stderr]    Compiling dtoa v0.4.1
[INFO] [stderr]    Compiling smallvec v0.2.1
[INFO] [stderr]    Compiling antidote v1.0.0
[INFO] [stderr]    Compiling safemem v0.2.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.4
[INFO] [stderr]    Compiling regex-syntax v0.4.0
[INFO] [stderr]    Compiling itoa v0.3.1
[INFO] [stderr]    Compiling take v0.1.0
[INFO] [stderr]    Compiling openssl-probe v0.1.1
[INFO] [stderr]    Compiling sequence_trie v0.2.1
[INFO] [stderr]    Compiling adler32 v1.0.2
[INFO] [stderr]    Compiling buf_redux v0.3.0
[INFO] [stderr]    Compiling pest v0.3.3
[INFO] [stderr]    Compiling same-file v0.1.3
[INFO] [stderr]    Compiling bufstream v0.1.3
[INFO] [stderr]    Compiling percent-encoding v1.0.0
[INFO] [stderr]    Compiling quick-error v1.2.0
[INFO] [stderr]    Compiling route-recognizer v0.1.12
[INFO] [stderr]    Compiling diff v0.1.10
[INFO] [stderr]    Compiling unsafe-any v0.4.1
[INFO] [stderr]    Compiling unicode-bidi v0.2.6
[INFO] [stderr]    Compiling base64 v0.5.2
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling time v0.1.37
[INFO] [stderr]    Compiling num_cpus v1.4.0
[INFO] [stderr]    Compiling iovec v0.1.0
[INFO] [stderr]    Compiling net2 v0.2.29
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling thread-id v3.1.0
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling mime v0.2.4
[INFO] [stderr]    Compiling fern v0.4.0
[INFO] [stderr]    Compiling num-integer v0.1.34
[INFO] [stderr]    Compiling num-complex v0.1.37
[INFO] [stderr]    Compiling unreachable v0.1.1
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]    Compiling crc v1.7.0
[INFO] [stderr]    Compiling base64 v0.6.0
[INFO] [stderr]    Compiling scheduled-thread-pool v0.1.0
[INFO] [stderr]    Compiling openssl-sys v0.9.12
[INFO] [stderr]    Compiling backtrace-sys v0.1.10
[INFO] [stderr]    Compiling libz-sys v1.0.13
[INFO] [stderr]    Compiling curl-sys v0.3.11
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling walkdir v1.0.7
[INFO] [stderr]    Compiling typemap v0.3.3
[INFO] [stderr]    Compiling tokio-service v0.1.0
[INFO] [stderr]    Compiling bytes v0.4.4
[INFO] [stderr]    Compiling idna v0.1.1
[INFO] [stderr]    Compiling aho-corasick v0.6.3
[INFO] [stderr]    Compiling postgres-protocol v0.2.2
[INFO] [stderr]    Compiling futures-cpupool v0.1.5
[INFO] [stderr]    Compiling mio v0.6.9
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling tempdir v0.3.5
[INFO] [stderr]    Compiling thread_local v0.3.3
[INFO] [stderr]    Compiling num-bigint v0.1.37
[INFO] [stderr]    Compiling num-iter v0.1.33
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling unicase v1.4.0
[INFO] [stderr]    Compiling hyper v0.10.10
[INFO] [stderr]    Compiling unicase v2.0.0
[INFO] [stderr]    Compiling r2d2 v0.7.2
[INFO] [stderr]    Compiling plugin v0.2.6
[INFO] [stderr]    Compiling tokio-io v0.1.2
[INFO] [stderr]    Compiling regex v0.2.1
[INFO] [stderr]    Compiling num-rational v0.1.36
[INFO] [stderr]    Compiling url v1.4.0
[INFO] [stderr]    Compiling serde_json v1.0.2
[INFO] [stderr]    Compiling envy v0.3.1
[INFO] [stderr]    Compiling libflate v0.1.14
[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-1.4.0/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]    Compiling tokio-core v0.1.8
[INFO] [stderr]    Compiling num v0.1.37
[INFO] [stderr]    Compiling phf_shared v0.7.21
[INFO] [stderr]    Compiling serde_derive_internals v0.15.0
[INFO] [stderr]    Compiling serde_urlencoded v0.5.1
[INFO] [stderr]    Compiling url_serde v0.2.0
[INFO] [stderr]    Compiling mime v0.3.2
[INFO] [stderr]    Compiling chrono v0.3.1
[INFO] [stderr]    Compiling phf_generator v0.7.21
[INFO] [stderr]    Compiling phf v0.7.21
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.7
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]    Compiling backtrace v0.3.2
[INFO] [stderr]    Compiling mime_guess v1.8.1
[INFO] [stderr]    Compiling handlebars v0.26.2
[INFO] [stderr]    Compiling postgres-shared v0.2.1
[INFO] [stderr]    Compiling native-tls v0.1.2
[INFO] [stderr]    Compiling cookie v0.5.1
[INFO] [stderr]    Compiling error-chain v0.10.0
[INFO] [stderr]    Compiling error-chain v0.7.2
[INFO] [stderr]    Compiling hyper v0.11.0
[INFO] [stderr]    Compiling tokio-tls v0.1.2
[INFO] [stderr] error: failed to run custom build command for `mime_guess v1.8.1`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/mime_guess-f9cb7f1394ef42c7/build-script-gen_mime_types` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: Other, message: "Read-only file system" }', src/libcore/result.rs:999:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x55b123a90f4b - backtrace::backtrace::libunwind::trace::hfe5db90796807973
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x55b123a90f4b - backtrace::backtrace::trace_unsynchronized::h34b865a835594335
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x55b123a90f4b - std::sys_common::backtrace::_print::h527254ae44989167
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x55b123a90f4b - std::sys_common::backtrace::print::he85dd5ddddf46503
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x55b123a90f4b - std::panicking::default_hook::{{closure}}::h847a2eb38b396f14
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x55b123a90c27 - std::panicking::default_hook::h2ca0f9a30a0e206b
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x55b123a91610 - std::panicking::rust_panic_with_hook::hffcefc09751839d1
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x55b123a91192 - std::panicking::continue_panic_fmt::hc0f142c930c846fc
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x55b123a91076 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x55b123aa5c2d - core::panicking::panic_fmt::h2daf88b2616ca2b2
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x55b123a84048 - core::result::unwrap_failed::h401cf511602eb905
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libcore/macros.rs:18
[INFO] [stderr]   11:     0x55b123a5100c - core::result::Result<T,E>::unwrap::h699b23bba0eb2d59
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libcore/result.rs:800
[INFO] [stderr]   12:     0x55b123a54265 - build_script_gen_mime_types::main::h4470f453a9ba23da
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/mime_guess-1.8.1/src/gen_mime_types.rs:22
[INFO] [stderr]   13:     0x55b123a7aa40 - std::rt::lang_start::{{closure}}::h6d1d493ef9e4cb13
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libstd/rt.rs:64
[INFO] [stderr]   14:     0x55b123a91063 - std::rt::lang_start_internal::{{closure}}::h447d8812e3ee306d
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   15:     0x55b123a91063 - std::panicking::try::do_call::h4a61cb372364c745
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   16:     0x55b123a92e0a - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:82
[INFO] [stderr]   17:     0x55b123a91b1d - std::panicking::try::hdf71f938885bca42
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   18:     0x55b123a91b1d - std::panic::catch_unwind::h7e85dbf162b1611a
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   19:     0x55b123a91b1d - std::rt::lang_start_internal::h1e06cc26b9fc25ea
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   20:     0x55b123a7aa19 - std::rt::lang_start::h717566047c8a3cd6
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libstd/rt.rs:64
[INFO] [stderr]   21:     0x55b123a5589a - main
[INFO] [stderr]   22:     0x7fefb52992e1 - __libc_start_main
[INFO] [stderr]   23:     0x55b123a2fc9a - _start
[INFO] [stderr]   24:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4334c0861d88e3cca6ab0c2118e7898f07597a8ac7f610a9635f5eb0252ef36e"`
[INFO] running `"docker" "rm" "-f" "4334c0861d88e3cca6ab0c2118e7898f07597a8ac7f610a9635f5eb0252ef36e"`
[INFO] [stdout] 4334c0861d88e3cca6ab0c2118e7898f07597a8ac7f610a9635f5eb0252ef36e