[INFO] crate flutter-engine 0.3.3 is already in cache
[INFO] extracting crate flutter-engine 0.3.3 into work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/reg/flutter-engine/0.3.3
[INFO] extracting crate flutter-engine 0.3.3 into work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/reg/flutter-engine/0.3.3
[INFO] validating manifest of flutter-engine-0.3.3 on toolchain master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of flutter-engine-0.3.3 on toolchain try#18481b65f318e0b4b20c0fc61340054701719d6c
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing flutter-engine-0.3.3
[INFO] finished frobbing flutter-engine-0.3.3
[INFO] frobbed toml for flutter-engine-0.3.3 written to work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/reg/flutter-engine/0.3.3/Cargo.toml
[INFO] started frobbing flutter-engine-0.3.3
[INFO] finished frobbing flutter-engine-0.3.3
[INFO] frobbed toml for flutter-engine-0.3.3 written to work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/reg/flutter-engine/0.3.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking flutter-engine-0.3.3 against master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7 for pr-62507
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62507/worker-6/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/reg/flutter-engine/0.3.3:/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=forbid" "-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" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] a98da447d9c457b984918999534d1c01d889f99b76c3e28223fd5534798446f8
[INFO] running `"docker" "start" "-a" "a98da447d9c457b984918999534d1c01d889f99b76c3e28223fd5534798446f8"`
[INFO] [stderr]    Compiling curl v0.4.22
[INFO] [stderr]    Compiling transformation-pipeline v0.1.0
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.1
[INFO] [stderr]    Compiling curl-sys v0.4.20
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]     Checking glfw v0.28.0
[INFO] [stderr]    Compiling unzip v0.1.0
[INFO] [stderr]    Compiling bindgen v0.42.3
[INFO] [stderr]    Compiling flutter-download v0.3.0
[INFO] [stderr]    Compiling flutter-engine-sys v0.3.2
[INFO] [stderr] error: failed to run custom build command for `flutter-engine-sys v0.3.2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/flutter-engine-sys-9c4a1474dbc7957f/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] error: 'rustfmt' is not installed for the toolchain '78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt'
[INFO] [stderr] To install, run `rustup component add rustfmt --toolchain 78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt`
[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:1051:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x5648dbb06cbb - backtrace::backtrace::libunwind::trace::h4f04af92f39f2b78
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x5648dbb06cbb - backtrace::backtrace::trace_unsynchronized::hb28ce8d2b7fb3e31
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x5648dbb06cbb - std::sys_common::backtrace::_print::he3f49d2d13a51ff1
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x5648dbb06cbb - std::sys_common::backtrace::print::h46c2f3b13519e9bf
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x5648dbb06cbb - std::panicking::default_hook::{{closure}}::h6694acddafc67583
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x5648dbb06997 - std::panicking::default_hook::hb4761d2feeb6d93c
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x5648dbb07430 - std::panicking::rust_panic_with_hook::h7a5f9620b0a832bc
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x5648dbb06fb2 - std::panicking::continue_panic_fmt::h76588b16c9674f9c
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x5648dbb06e96 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x5648dbb27afd - core::panicking::panic_fmt::hcce9be08ab68e123
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x5648db33b0a6 - core::result::unwrap_failed::h2d714ccdd18b4c85
[INFO] [stderr]                                at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/libcore/macros.rs:18
[INFO] [stderr]   11:     0x5648db33b55a - core::result::Result<T,E>::expect::hddf086791cee0d1a
[INFO] [stderr]                                at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/libcore/result.rs:879
[INFO] [stderr]   12:     0x5648db33893b - build_script_build::main::h0626a8140e9c5a29
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/flutter-engine-sys-0.3.2/build.rs:48
[INFO] [stderr]   13:     0x5648db3352e0 - std::rt::lang_start::{{closure}}::h2a5ff31b5fbf9d8f
[INFO] [stderr]                                at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/libstd/rt.rs:64
[INFO] [stderr]   14:     0x5648dbb06e33 - std::rt::lang_start_internal::{{closure}}::h32e298b4b9152770
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   15:     0x5648dbb06e33 - std::panicking::try::do_call::hc8de7cda8a6a61da
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   16:     0x5648dbb0fd0a - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:82
[INFO] [stderr]   17:     0x5648dbb079fd - std::panicking::try::h2d3ab36572ae54da
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   18:     0x5648dbb079fd - std::panic::catch_unwind::h4b587439b0094333
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   19:     0x5648dbb079fd - std::rt::lang_start_internal::h0772ca1bc29dd619
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   20:     0x5648db3352b9 - std::rt::lang_start::h4a15dab7f7466994
[INFO] [stderr]                                at /rustc/78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/src/libstd/rt.rs:64
[INFO] [stderr]   21:     0x5648db33997a - main
[INFO] [stderr]   22:     0x7f4e303c82e1 - __libc_start_main
[INFO] [stderr]   23:     0x5648db3310ba - _start
[INFO] [stderr]   24:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "a98da447d9c457b984918999534d1c01d889f99b76c3e28223fd5534798446f8"`
[INFO] running `"docker" "rm" "-f" "a98da447d9c457b984918999534d1c01d889f99b76c3e28223fd5534798446f8"`
[INFO] [stdout] a98da447d9c457b984918999534d1c01d889f99b76c3e28223fd5534798446f8