[INFO] crate nanny 0.0.9 is already in cache
[INFO] extracting crate nanny 0.0.9 into work/ex/beta-1.38-1/sources/1.37.0/reg/nanny/0.0.9
[INFO] extracting crate nanny 0.0.9 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/nanny/0.0.9
[INFO] validating manifest of nanny-0.0.9 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 nanny-0.0.9 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 nanny-0.0.9
[INFO] removed path dependency nanny-sys from nanny-0.0.9
[INFO] finished frobbing nanny-0.0.9
[INFO] frobbed toml for nanny-0.0.9 written to work/ex/beta-1.38-1/sources/1.37.0/reg/nanny/0.0.9/Cargo.toml
[INFO] started frobbing nanny-0.0.9
[INFO] removed path dependency nanny-sys from nanny-0.0.9
[INFO] finished frobbing nanny-0.0.9
[INFO] frobbed toml for nanny-0.0.9 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/nanny/0.0.9/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 nanny-0.0.9 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-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/nanny/0.0.9:/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] b4908f7dc9267eb9cad6a265f49ef4136fd5216d62d6c90b56d01ea665750567
[INFO] running `"docker" "start" "-a" "b4908f7dc9267eb9cad6a265f49ef4136fd5216d62d6c90b56d01ea665750567"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling nanny-sys v0.0.6
[INFO] [stderr] error: failed to run custom build command for `nanny-sys v0.0.6`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/nanny-sys-36e173c874052be7/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:378:21
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x555fd2d9dbbb - 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:     0x555fd2d9dbbb - 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:     0x555fd2d9dbbb - std::sys_common::backtrace::_print::h24f527b44b6cfc06
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x555fd2d9dbbb - std::sys_common::backtrace::print::h712608e4347fd64a
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x555fd2d9dbbb - std::panicking::default_hook::{{closure}}::h6c3d570c2b500048
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x555fd2d9d896 - std::panicking::default_hook::hb29963fb4747e0dd
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x555fd2d9e2dd - std::panicking::rust_panic_with_hook::hd1236c3083de823a
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x555fd2d9de62 - std::panicking::continue_panic_fmt::he38ad41d6304a12c
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x555fd2d9dd46 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x555fd2db945d - core::panicking::panic_fmt::h1bc6de43c92ad80c
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x555fd2db939c - core::panicking::panic::h411fb8ce50d26c19
[INFO] [stderr]                                at src/libcore/panicking.rs:49
[INFO] [stderr]   11:     0x555fd2d3e267 - core::option::Option<T>::unwrap::he6e70e5ad66b3f4c
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libcore/macros.rs:12
[INFO] [stderr]   12:     0x555fd2d3dde5 - build_script_build::build_object_file::h15cdc22851b89302
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/nanny-sys-0.0.6/build.rs:23
[INFO] [stderr]   13:     0x555fd2d3e116 - build_script_build::main::h336304da66173080
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/nanny-sys-0.0.6/build.rs:41
[INFO] [stderr]   14:     0x555fd2d3f250 - std::rt::lang_start::{{closure}}::h9d929e64bb31b010
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libstd/rt.rs:64
[INFO] [stderr]   15:     0x555fd2d9dd33 - std::rt::lang_start_internal::{{closure}}::hf367a5a6ae52b0ce
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   16:     0x555fd2d9dd33 - std::panicking::try::do_call::h9d779bc5e27e3284
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   17:     0x555fd2da608a - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:80
[INFO] [stderr]   18:     0x555fd2d9e7ed - std::panicking::try::h4af22d9cb0afa351
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   19:     0x555fd2d9e7ed - std::panic::catch_unwind::hbb68a9ada87bfb97
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   20:     0x555fd2d9e7ed - std::rt::lang_start_internal::hba9e09d74440ce4d
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   21:     0x555fd2d3f229 - std::rt::lang_start::hd09dce71e2d6650e
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libstd/rt.rs:64
[INFO] [stderr]   22:     0x555fd2d3e14a - main
[INFO] [stderr]   23:     0x7f6ced1202e1 - __libc_start_main
[INFO] [stderr]   24:     0x555fd2d3d94a - _start
[INFO] [stderr]   25:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "b4908f7dc9267eb9cad6a265f49ef4136fd5216d62d6c90b56d01ea665750567"`
[INFO] running `"docker" "rm" "-f" "b4908f7dc9267eb9cad6a265f49ef4136fd5216d62d6c90b56d01ea665750567"`
[INFO] [stdout] b4908f7dc9267eb9cad6a265f49ef4136fd5216d62d6c90b56d01ea665750567