[INFO] crate flutter-engine-sys 0.3.2 is already in cache
[INFO] extracting crate flutter-engine-sys 0.3.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/flutter-engine-sys/0.3.2
[INFO] extracting crate flutter-engine-sys 0.3.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/flutter-engine-sys/0.3.2
[INFO] validating manifest of flutter-engine-sys-0.3.2 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 flutter-engine-sys-0.3.2 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 flutter-engine-sys-0.3.2
[INFO] finished frobbing flutter-engine-sys-0.3.2
[INFO] frobbed toml for flutter-engine-sys-0.3.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/flutter-engine-sys/0.3.2/Cargo.toml
[INFO] started frobbing flutter-engine-sys-0.3.2
[INFO] finished frobbing flutter-engine-sys-0.3.2
[INFO] frobbed toml for flutter-engine-sys-0.3.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/flutter-engine-sys/0.3.2/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing flutter-engine-sys-0.3.2 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-6/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/flutter-engine-sys/0.3.2:/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] 4a45d33a54ecba48ce2546d586cfda4661430c178ff51af045a4928942eb99dd
[INFO] running `"docker" "start" "-a" "4a45d33a54ecba48ce2546d586cfda4661430c178ff51af045a4928942eb99dd"`
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling adler32 v1.0.3
[INFO] [stderr]    Compiling curl v0.4.22
[INFO] [stderr]    Compiling podio v0.1.6
[INFO] [stderr]    Compiling bindgen v0.42.3
[INFO] [stderr]    Compiling transformation-pipeline v0.1.0
[INFO] [stderr]    Compiling openssl-probe v0.1.2
[INFO] [stderr]    Compiling bzip2-sys v0.1.7
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.2
[INFO] [stderr]    Compiling openssl-sys v0.9.49
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling curl-sys v0.4.20
[INFO] [stderr]    Compiling clang-sys v0.26.4
[INFO] [stderr]    Compiling miniz_oxide v0.3.2
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling socket2 v0.3.11
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling which v1.0.5
[INFO] [stderr]    Compiling msdos_time v0.1.6
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling flate2 v1.0.11
[INFO] [stderr]    Compiling bzip2 v0.3.3
[INFO] [stderr]    Compiling zip v0.2.8
[INFO] [stderr]    Compiling cexpr v0.3.5
[INFO] [stderr]    Compiling unzip v0.1.0
[INFO] [stderr]    Compiling flutter-download v0.3.0
[INFO] [stderr]    Compiling flutter-engine-sys v0.3.2 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `flutter-engine-sys v0.3.2 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/flutter-engine-sys-b9cd77598b6b7037/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] error: 'rustfmt' is not installed for the toolchain 'beta-2019-08-13-x86_64-unknown-linux-gnu'
[INFO] [stderr] To install, run `rustup component add rustfmt --toolchain beta-2019-08-13-x86_64-unknown-linux-gnu`
[INFO] [stderr] Custom { kind: Other, error: "Internal rustfmt error" }
[INFO] [stderr] thread 'main' panicked at 'Cannot get flutter engine version: InvalidFlutterRoot("output empty")', src/libcore/result.rs:1084:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x55e9e327352b - 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:     0x55e9e327352b - 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:     0x55e9e327352b - std::sys_common::backtrace::_print::h24f527b44b6cfc06
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x55e9e327352b - std::sys_common::backtrace::print::h712608e4347fd64a
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x55e9e327352b - std::panicking::default_hook::{{closure}}::h6c3d570c2b500048
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x55e9e3273206 - std::panicking::default_hook::hb29963fb4747e0dd
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x55e9e3273c9d - std::panicking::rust_panic_with_hook::hd1236c3083de823a
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x55e9e3273822 - std::panicking::continue_panic_fmt::he38ad41d6304a12c
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x55e9e3273706 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x55e9e329427d - core::panicking::panic_fmt::h1bc6de43c92ad80c
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x55e9e3294377 - core::result::unwrap_failed::hd83f272814becce6
[INFO] [stderr]                                at src/libcore/result.rs:1084
[INFO] [stderr]   11:     0x55e9e2a90112 - core::result::Result<T,E>::expect::h4cbffb80cea6a446
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libcore/result.rs:879
[INFO] [stderr]   12:     0x55e9e2a8c73b - build_script_build::main::hc3baa640baf1ff45
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:48
[INFO] [stderr]   13:     0x55e9e2a88990 - std::rt::lang_start::{{closure}}::h27fd114b46fc4499
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libstd/rt.rs:64
[INFO] [stderr]   14:     0x55e9e32736a3 - std::rt::lang_start_internal::{{closure}}::hf367a5a6ae52b0ce
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   15:     0x55e9e32736a3 - std::panicking::try::do_call::h9d779bc5e27e3284
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   16:     0x55e9e327c54a - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:80
[INFO] [stderr]   17:     0x55e9e327426d - std::panicking::try::h4af22d9cb0afa351
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   18:     0x55e9e327426d - std::panic::catch_unwind::hbb68a9ada87bfb97
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   19:     0x55e9e327426d - std::rt::lang_start_internal::hba9e09d74440ce4d
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   20:     0x55e9e2a88969 - std::rt::lang_start::h89ffeabd3b8e1fd7
[INFO] [stderr]                                at /rustc/e450539c2a8d7f791268d699cbe45ab3e57d43a1/src/libstd/rt.rs:64
[INFO] [stderr]   21:     0x55e9e2a8d72a - main
[INFO] [stderr]   22:     0x7f4589ef52e1 - __libc_start_main
[INFO] [stderr]   23:     0x55e9e2a852ca - _start
[INFO] [stderr]   24:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "4a45d33a54ecba48ce2546d586cfda4661430c178ff51af045a4928942eb99dd"`
[INFO] running `"docker" "rm" "-f" "4a45d33a54ecba48ce2546d586cfda4661430c178ff51af045a4928942eb99dd"`
[INFO] [stdout] 4a45d33a54ecba48ce2546d586cfda4661430c178ff51af045a4928942eb99dd