[INFO] fetching crate vowpalwabbit-sys 8.7.0...
[INFO] extracting crate vowpalwabbit-sys 8.7.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/vowpalwabbit-sys/8.7.0
[INFO] extracting crate vowpalwabbit-sys 8.7.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/vowpalwabbit-sys/8.7.0
[INFO] validating manifest of vowpalwabbit-sys-8.7.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of vowpalwabbit-sys-8.7.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing vowpalwabbit-sys-8.7.0
[INFO] finished frobbing vowpalwabbit-sys-8.7.0
[INFO] frobbed toml for vowpalwabbit-sys-8.7.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/vowpalwabbit-sys/8.7.0/Cargo.toml
[INFO] started frobbing vowpalwabbit-sys-8.7.0
[INFO] finished frobbing vowpalwabbit-sys-8.7.0
[INFO] frobbed toml for vowpalwabbit-sys-8.7.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/vowpalwabbit-sys/8.7.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing vowpalwabbit-sys-8.7.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/vowpalwabbit-sys/8.7.0:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] b95bd9e63c93934b9e54a2b16e43cd77e5c0aa05d3aea5f14057361b8451ee30
[INFO] running `"docker" "start" "-a" "b95bd9e63c93934b9e54a2b16e43cd77e5c0aa05d3aea5f14057361b8451ee30"`
[INFO] [stderr]    Compiling vowpalwabbit-sys v8.7.0 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `vowpalwabbit-sys v8.7.0 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/vowpalwabbit-sys-33333b7f1f0207aa/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Failure { command: "\"pkg-config\" \"--libs\" \"--cflags\" \"libvw_c_wrapper\" \"libvw_c_wrapper >= 8.7.0\"", output: Output { status: ExitStatus(ExitStatus(256)), stdout: "", stderr: "Package libvw_c_wrapper was not found in the pkg-config search path.\nPerhaps you should add the directory containing `libvw_c_wrapper.pc\'\nto the PKG_CONFIG_PATH environment variable\nNo package \'libvw_c_wrapper\' found\nPackage libvw_c_wrapper was not found in the pkg-config search path.\nPerhaps you should add the directory containing `libvw_c_wrapper.pc\'\nto the PKG_CONFIG_PATH environment variable\nNo package \'libvw_c_wrapper\' found\n" } }', src/libcore/result.rs:999:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x557b51265133 - std::sys::unix::backtrace::tracing::imp::unwind_backtrace::h6485381528590a55
[INFO] [stderr]                                at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
[INFO] [stderr]    1:     0x557b51260a5b - std::sys_common::backtrace::_print::h49a82ae9552e35c7
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:71
[INFO] [stderr]    2:     0x557b51263e26 - std::panicking::default_hook::{{closure}}::he20974adbefcc046
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:59
[INFO] [stderr]                                at src/libstd/panicking.rs:197
[INFO] [stderr]    3:     0x557b51263bb9 - std::panicking::default_hook::he4af6af4ac7fef7b
[INFO] [stderr]                                at src/libstd/panicking.rs:211
[INFO] [stderr]    4:     0x557b5126452f - std::panicking::rust_panic_with_hook::h057ff03eb4c8000f
[INFO] [stderr]                                at src/libstd/panicking.rs:474
[INFO] [stderr]    5:     0x557b512640b1 - std::panicking::continue_panic_fmt::ha6d6ae144369025b
[INFO] [stderr]                                at src/libstd/panicking.rs:381
[INFO] [stderr]    6:     0x557b51263f95 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:308
[INFO] [stderr]    7:     0x557b5127f73c - core::panicking::panic_fmt::hc4f83bfed80aeabd
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]    8:     0x557b50b83cd2 - core::result::unwrap_failed::h5c4219313fd0ae3e
[INFO] [stderr]                                at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libcore/macros.rs:18
[INFO] [stderr]    9:     0x557b50b840ba - core::result::Result<T,E>::unwrap::h622fca1bf9c29ab7
[INFO] [stderr]                                at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libcore/result.rs:800
[INFO] [stderr]   10:     0x557b50b80da4 - build_script_build::main::h2cf3bbd46e32da82
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:8
[INFO] [stderr]   11:     0x557b50b83b5f - std::rt::lang_start::{{closure}}::ha12e11050830c95f
[INFO] [stderr]                                at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libstd/rt.rs:64
[INFO] [stderr]   12:     0x557b51263f32 - std::panicking::try::do_call::hc3d8373a0b215f51
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]                                at src/libstd/panicking.rs:293
[INFO] [stderr]   13:     0x557b5126bf79 - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:85
[INFO] [stderr]   14:     0x557b51264a3c - std::rt::lang_start_internal::he5218c8b95d395f2
[INFO] [stderr]                                at src/libstd/panicking.rs:272
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   15:     0x557b50b83b38 - std::rt::lang_start::h0466b1849347c7d1
[INFO] [stderr]                                at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c/src/libstd/rt.rs:64
[INFO] [stderr]   16:     0x557b50b80f99 - main
[INFO] [stderr]   17:     0x7f9272a2d2e0 - __libc_start_main
[INFO] [stderr]   18:     0x557b50b80b79 - _start
[INFO] [stderr]   19:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "b95bd9e63c93934b9e54a2b16e43cd77e5c0aa05d3aea5f14057361b8451ee30"`
[INFO] running `"docker" "rm" "-f" "b95bd9e63c93934b9e54a2b16e43cd77e5c0aa05d3aea5f14057361b8451ee30"`
[INFO] [stdout] b95bd9e63c93934b9e54a2b16e43cd77e5c0aa05d3aea5f14057361b8451ee30