[INFO] updating cached repository casimir/ufind
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/casimir/ufind
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/casimir/ufind" "work/ex/beta-1.38-1/sources/1.37.0/gh/casimir/ufind"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/casimir/ufind'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/casimir/ufind" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/casimir/ufind"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/casimir/ufind'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f43e2ac87871d2aa1c40b1b5566b31ff1f17887b
[INFO] sha for GitHub repo casimir/ufind: f43e2ac87871d2aa1c40b1b5566b31ff1f17887b
[INFO] validating manifest of casimir/ufind 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 casimir/ufind 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 casimir/ufind
[INFO] finished frobbing casimir/ufind
[INFO] frobbed toml for casimir/ufind written to work/ex/beta-1.38-1/sources/1.37.0/gh/casimir/ufind/Cargo.toml
[INFO] started frobbing casimir/ufind
[INFO] finished frobbing casimir/ufind
[INFO] frobbed toml for casimir/ufind written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/casimir/ufind/Cargo.toml
[INFO] crate casimir/ufind 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 casimir/ufind 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/casimir/ufind:/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] 813bfc3569cec878804b041accafb34118e42f4f305f5aef1063a9a8f059acc2
[INFO] running `"docker" "start" "-a" "813bfc3569cec878804b041accafb34118e42f4f305f5aef1063a9a8f059acc2"`
[INFO] [stderr]    Compiling atty v0.2.2
[INFO] [stderr]    Compiling term_size v0.2.3
[INFO] [stderr]    Compiling clap v2.23.1
[INFO] [stderr]    Compiling ufind v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `ufind v0.3.1 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/ufind-597665a736b18d26/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'couldn't create completion file: other os error', /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/clap-2.23.1/src/app/parser.rs:113:25
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x5641b5e6faeb - backtrace::backtrace::libunwind::trace::h23ae608c8b906c69
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x5641b5e6faeb - backtrace::backtrace::trace_unsynchronized::h65b3ea295a85fd48
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x5641b5e6faeb - std::sys_common::backtrace::_print::h24f527b44b6cfc06
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x5641b5e6faeb - std::sys_common::backtrace::print::h712608e4347fd64a
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x5641b5e6faeb - std::panicking::default_hook::{{closure}}::h6c3d570c2b500048
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x5641b5e6f7c6 - std::panicking::default_hook::hb29963fb4747e0dd
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x5641b5e701ad - std::panicking::rust_panic_with_hook::hd1236c3083de823a
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x5641b5e6fd32 - std::panicking::continue_panic_fmt::he38ad41d6304a12c
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x5641b5e6fc7f - std::panicking::begin_panic_fmt::h4b478f1ed53f4521
[INFO] [stderr]                                at src/libstd/panicking.rs:339
[INFO] [stderr]    9:     0x5641b5dd58ca - clap::app::parser::Parser::gen_completions::h5bd8550701e6a997
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/clap-2.23.1/src/app/parser.rs:113
[INFO] [stderr]   10:     0x5641b5dd2527 - clap::app::App::gen_completions::hc13438c2776208df
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/clap-2.23.1/src/app/mod.rs:1385
[INFO] [stderr]   11:     0x5641b5dd2946 - build_script_build::main::hc405b8a8f8b6671b
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:15
[INFO] [stderr]   12:     0x5641b5dd4030 - std::rt::lang_start::{{closure}}::h29172aa218ab7937
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libstd/rt.rs:64
[INFO] [stderr]   13:     0x5641b5e6fc03 - std::rt::lang_start_internal::{{closure}}::hf367a5a6ae52b0ce
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   14:     0x5641b5e6fc03 - std::panicking::try::do_call::h9d779bc5e27e3284
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   15:     0x5641b5e71eda - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:80
[INFO] [stderr]   16:     0x5641b5e706bd - std::panicking::try::h4af22d9cb0afa351
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   17:     0x5641b5e706bd - std::panic::catch_unwind::hbb68a9ada87bfb97
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   18:     0x5641b5e706bd - std::rt::lang_start_internal::hba9e09d74440ce4d
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   19:     0x5641b5dd4009 - std::rt::lang_start::h22d01b573245f697
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libstd/rt.rs:64
[INFO] [stderr]   20:     0x5641b5dd2a2a - main
[INFO] [stderr]   21:     0x7fd6329632e1 - __libc_start_main
[INFO] [stderr]   22:     0x5641b5dd229a - _start
[INFO] [stderr]   23:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "813bfc3569cec878804b041accafb34118e42f4f305f5aef1063a9a8f059acc2"`
[INFO] running `"docker" "rm" "-f" "813bfc3569cec878804b041accafb34118e42f4f305f5aef1063a9a8f059acc2"`
[INFO] [stdout] 813bfc3569cec878804b041accafb34118e42f4f305f5aef1063a9a8f059acc2