[INFO] updating cached repository fcobackup/fco-backup-fetcher
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/fcobackup/fco-backup-fetcher
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/fcobackup/fco-backup-fetcher" "work/ex/beta-1.38-1/sources/1.37.0/gh/fcobackup/fco-backup-fetcher"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/fcobackup/fco-backup-fetcher'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/fcobackup/fco-backup-fetcher" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fcobackup/fco-backup-fetcher"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fcobackup/fco-backup-fetcher'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 404d5969525c04eccc8432524bc32421347a2aa0
[INFO] sha for GitHub repo fcobackup/fco-backup-fetcher: 404d5969525c04eccc8432524bc32421347a2aa0
[INFO] validating manifest of fcobackup/fco-backup-fetcher 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 fcobackup/fco-backup-fetcher 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 fcobackup/fco-backup-fetcher
[INFO] finished frobbing fcobackup/fco-backup-fetcher
[INFO] frobbed toml for fcobackup/fco-backup-fetcher written to work/ex/beta-1.38-1/sources/1.37.0/gh/fcobackup/fco-backup-fetcher/Cargo.toml
[INFO] started frobbing fcobackup/fco-backup-fetcher
[INFO] finished frobbing fcobackup/fco-backup-fetcher
[INFO] frobbed toml for fcobackup/fco-backup-fetcher written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fcobackup/fco-backup-fetcher/Cargo.toml
[INFO] crate fcobackup/fco-backup-fetcher 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 fcobackup/fco-backup-fetcher 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/fcobackup/fco-backup-fetcher:/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] 27b9c32c52ca83f5f35820f84dc11eb893ecce07495ff41e55bd411732c949a4
[INFO] running `"docker" "start" "-a" "27b9c32c52ca83f5f35820f84dc11eb893ecce07495ff41e55bd411732c949a4"`
[INFO] [stderr]    Compiling version_check v0.1.3
[INFO] [stderr]    Compiling siphasher v0.2.2
[INFO] [stderr]    Compiling futures v0.1.17
[INFO] [stderr]    Compiling slab v0.3.0
[INFO] [stderr]    Compiling lazycell v0.6.0
[INFO] [stderr]    Compiling num-traits v0.1.41
[INFO] [stderr]    Compiling slab v0.4.0
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling scoped-tls v0.1.0
[INFO] [stderr]    Compiling matches v0.1.6
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling unicode-normalization v0.1.5
[INFO] [stderr]    Compiling take v0.1.0
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling smallvec v0.2.1
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling safemem v0.2.0
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling unicode-width v0.1.4
[INFO] [stderr]    Compiling bitflags v0.4.0
[INFO] [stderr]    Compiling derive_builder v0.5.1
[INFO] [stderr]    Compiling httparse v1.2.4
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]    Compiling adler32 v1.0.2
[INFO] [stderr]    Compiling peresil v0.3.0
[INFO] [stderr]    Compiling utf8-ranges v1.0.0
[INFO] [stderr]    Compiling encode_unicode v0.1.3
[INFO] [stderr]    Compiling typed-arena v1.3.0
[INFO] [stderr]    Compiling vec_map v0.8.0
[INFO] [stderr]    Compiling regex-syntax v0.4.2
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]    Compiling bitflags v1.0.1
[INFO] [stderr]    Compiling ansi_term v0.10.2
[INFO] [stderr]    Compiling strsim v0.6.0
[INFO] [stderr]    Compiling quick-error v1.2.1
[INFO] [stderr]    Compiling iovec v0.1.1
[INFO] [stderr]    Compiling net2 v0.2.31
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling time v0.1.39
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling atty v0.2.6
[INFO] [stderr]    Compiling encoding_rs v0.7.2
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling base64 v0.9.0
[INFO] [stderr]    Compiling base64 v0.6.0
[INFO] [stderr]    Compiling textwrap v0.9.0
[INFO] [stderr]    Compiling nix v0.5.1
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling unicase v2.1.0
[INFO] [stderr]    Compiling num-integer v0.1.35
[INFO] [stderr]    Compiling sxd-document v0.2.6
[INFO] [stderr]    Compiling serde_json v1.0.9
[INFO] [stderr]    Compiling bytes v0.4.6
[INFO] [stderr]    Compiling uuid v0.5.1
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling thread_local v0.3.5
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling tokio-service v0.1.0
[INFO] [stderr]    Compiling relay v0.1.0
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling tokio-timer v0.1.2
[INFO] [stderr]    Compiling clap v2.29.2
[INFO] [stderr]    Compiling mio v0.6.12
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling num-iter v0.1.34
[INFO] [stderr]    Compiling idna v0.1.4
[INFO] [stderr]    Compiling tokio-io v0.1.4
[INFO] [stderr]    Compiling regex v0.2.6
[INFO] [stderr]    Compiling rustyline v1.0.0
[INFO] [stderr]    Compiling num v0.1.41
[INFO] [stderr]    Compiling libflate v0.1.14
[INFO] [stderr]    Compiling phf_shared v0.7.21
[INFO] [stderr]    Compiling tokio-core v0.1.12
[INFO] [stderr]    Compiling native-tls v0.1.5
[INFO] [stderr]    Compiling chrono v0.4.0
[INFO] [stderr]    Compiling error-chain v0.11.0
[INFO] [stderr]    Compiling mime v0.3.5
[INFO] [stderr]    Compiling url v1.6.0
[INFO] [stderr]    Compiling serde_derive_internals v0.19.0
[INFO] [stderr]    Compiling derive_builder_core v0.2.0
[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-1.6.0/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 phf_generator v0.7.21
[INFO] [stderr]    Compiling phf v0.7.21
[INFO] [stderr]    Compiling sxd-xpath v0.4.1
[INFO] [stderr]    Compiling quick-xml v0.10.1
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling tokio-tls v0.1.4
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]    Compiling stderrlog v0.2.3
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.3
[INFO] [stderr]    Compiling serde_urlencoded v0.5.1
[INFO] [stderr]    Compiling hyper v0.10.13
[INFO] [stderr]    Compiling serde_derive v1.0.27
[INFO] [stderr]    Compiling atom_syndication v0.5.6
[INFO] [stderr]    Compiling hyper v0.11.14
[INFO] [stderr] error: failed to run custom build command for `mime_guess v2.0.0-alpha.3`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/mime_guess-e4c5f790fbd78f8f/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:     0x557ff01ccdab - 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:     0x557ff01ccdab - 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:     0x557ff01ccdab - std::sys_common::backtrace::_print::h527254ae44989167
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x557ff01ccdab - std::sys_common::backtrace::print::he85dd5ddddf46503
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x557ff01ccdab - std::panicking::default_hook::{{closure}}::h847a2eb38b396f14
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x557ff01cca87 - std::panicking::default_hook::h2ca0f9a30a0e206b
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x557ff01cd470 - std::panicking::rust_panic_with_hook::hffcefc09751839d1
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x557ff01ccff2 - std::panicking::continue_panic_fmt::hc0f142c930c846fc
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x557ff01cced6 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x557ff01e1a8d - core::panicking::panic_fmt::h2daf88b2616ca2b2
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x557ff01bfbe8 - core::result::unwrap_failed::hb234d7fff934f3b1
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libcore/macros.rs:18
[INFO] [stderr]   11:     0x557ff018d88c - core::result::Result<T,E>::unwrap::he240c71101876c75
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libcore/result.rs:800
[INFO] [stderr]   12:     0x557ff01909a5 - build_script_gen_mime_types::main::h04cbbe7901ddc79d
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/mime_guess-2.0.0-alpha.3/src/gen_mime_types.rs:22
[INFO] [stderr]   13:     0x557ff01b7180 - std::rt::lang_start::{{closure}}::h93b9e4a0fdb60cf6
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libstd/rt.rs:64
[INFO] [stderr]   14:     0x557ff01ccec3 - std::rt::lang_start_internal::{{closure}}::h447d8812e3ee306d
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   15:     0x557ff01ccec3 - std::panicking::try::do_call::h4a61cb372364c745
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   16:     0x557ff01cec6a - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:82
[INFO] [stderr]   17:     0x557ff01cd97d - std::panicking::try::hdf71f938885bca42
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   18:     0x557ff01cd97d - std::panic::catch_unwind::h7e85dbf162b1611a
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   19:     0x557ff01cd97d - std::rt::lang_start_internal::h1e06cc26b9fc25ea
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   20:     0x557ff01b7159 - std::rt::lang_start::h825b940307c2fb37
[INFO] [stderr]                                at /rustc/eae3437dfe991621e8afdc82734f4a172d7ddf9b/src/libstd/rt.rs:64
[INFO] [stderr]   21:     0x557ff0191fda - main
[INFO] [stderr]   22:     0x7efd853622e1 - __libc_start_main
[INFO] [stderr]   23:     0x557ff016c3fa - _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" "27b9c32c52ca83f5f35820f84dc11eb893ecce07495ff41e55bd411732c949a4"`
[INFO] running `"docker" "rm" "-f" "27b9c32c52ca83f5f35820f84dc11eb893ecce07495ff41e55bd411732c949a4"`
[INFO] [stdout] 27b9c32c52ca83f5f35820f84dc11eb893ecce07495ff41e55bd411732c949a4