[INFO] updating cached repository iohub/piece
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/iohub/piece
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/iohub/piece" "work/ex/pr-61753/sources/master#8e948df707ea8a3c88c65bf2ffdcb2f1cf5491be/gh/iohub/piece"`
[INFO] [stderr] Cloning into 'work/ex/pr-61753/sources/master#8e948df707ea8a3c88c65bf2ffdcb2f1cf5491be/gh/iohub/piece'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/iohub/piece" "work/ex/pr-61753/sources/try#af22dfc7f56a5057c6b6120a65c74e7b6c1530af/gh/iohub/piece"`
[INFO] [stderr] Cloning into 'work/ex/pr-61753/sources/try#af22dfc7f56a5057c6b6120a65c74e7b6c1530af/gh/iohub/piece'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2435d7c783184f70c410675578b16fbfc6330da2
[INFO] sha for GitHub repo iohub/piece: 2435d7c783184f70c410675578b16fbfc6330da2
[INFO] validating manifest of iohub/piece on toolchain master#8e948df707ea8a3c88c65bf2ffdcb2f1cf5491be
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8e948df707ea8a3c88c65bf2ffdcb2f1cf5491be-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of iohub/piece on toolchain try#af22dfc7f56a5057c6b6120a65c74e7b6c1530af
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+af22dfc7f56a5057c6b6120a65c74e7b6c1530af-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing iohub/piece
[INFO] finished frobbing iohub/piece
[INFO] frobbed toml for iohub/piece written to work/ex/pr-61753/sources/master#8e948df707ea8a3c88c65bf2ffdcb2f1cf5491be/gh/iohub/piece/Cargo.toml
[INFO] started frobbing iohub/piece
[INFO] finished frobbing iohub/piece
[INFO] frobbed toml for iohub/piece written to work/ex/pr-61753/sources/try#af22dfc7f56a5057c6b6120a65c74e7b6c1530af/gh/iohub/piece/Cargo.toml
[INFO] crate iohub/piece already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8e948df707ea8a3c88c65bf2ffdcb2f1cf5491be-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+af22dfc7f56a5057c6b6120a65c74e7b6c1530af-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] checking iohub/piece against try#af22dfc7f56a5057c6b6120a65c74e7b6c1530af for pr-61753
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61753/worker-0/try#af22dfc7f56a5057c6b6120a65c74e7b6c1530af:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61753/sources/try#af22dfc7f56a5057c6b6120a65c74e7b6c1530af/gh/iohub/piece:/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" "+af22dfc7f56a5057c6b6120a65c74e7b6c1530af-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 93700ecb971650b94eed2ee4ff8a3386f4b3020a2f1f6ef2a94f4c523def455e
[INFO] running `"docker" "start" "-a" "93700ecb971650b94eed2ee4ff8a3386f4b3020a2f1f6ef2a94f4c523def455e"`
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]    Compiling docopt v1.0.2
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling lalrpop v0.16.3
[INFO] [stderr]    Compiling llvm-sys v60.3.0
[INFO] [stderr] error: failed to run custom build command for `llvm-sys v60.3.0`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/llvm-sys-e5615781102f41a4/build-script-build` (exit code: 101)
[INFO] [stderr] --- stdout
[INFO] [stderr] Found LLVM version 3.8.0 on PATH, but need 6.0.0.
[INFO] [stderr] Didn't find usable system-wide LLVM.
[INFO] [stderr] No suitable version of LLVM was found system-wide or pointed
[INFO] [stderr]                   to by LLVM_SYS_60_PREFIX.
[INFO] [stderr]                   
[INFO] [stderr]                   Consider using `llvmenv` to compile an appropriate copy of LLVM, and
[INFO] [stderr]                   refer to the llvm-sys documentation for more information.
[INFO] [stderr]                   
[INFO] [stderr]                   llvm-sys: https://crates.io/crates/llvm-sys
[INFO] [stderr]                   llvmenv: https://crates.io/crates/llvmenv
[INFO] [stderr] 
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'Could not find a compatible version of LLVM', /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/llvm-sys-60.3.0/build.rs:63:9
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x563de5c548fb - backtrace::backtrace::libunwind::trace::h070e7f82042bca1a
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x563de5c548fb - backtrace::backtrace::trace_unsynchronized::he13049b85698ba8d
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x563de5c548fb - std::sys_common::backtrace::_print::h634e2ea8248267c1
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x563de5c548fb - std::sys_common::backtrace::print::h5d5de2cf218c89a7
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x563de5c548fb - std::panicking::default_hook::{{closure}}::h43b79773c0c0f232
[INFO] [stderr]                                at src/libstd/panicking.rs:198
[INFO] [stderr]    5:     0x563de5c545fc - std::panicking::default_hook::h53bc9afd22fb35b5
[INFO] [stderr]                                at src/libstd/panicking.rs:212
[INFO] [stderr]    6:     0x563de5c55070 - std::panicking::rust_panic_with_hook::h49c2fb11d2e8b48c
[INFO] [stderr]                                at src/libstd/panicking.rs:475
[INFO] [stderr]    7:     0x563de5bbda68 - std::panicking::begin_panic::h9e17f0c975c7d4d0
[INFO] [stderr]                                at /rustc/af22dfc7f56a5057c6b6120a65c74e7b6c1530af/src/libstd/panicking.rs:409
[INFO] [stderr]    8:     0x563de59fb39a - <build_script_build::LLVM_CONFIG_PATH as core::ops::deref::Deref>::deref::__static_ref_initialize::h72bb70b53446d4f0
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/llvm-sys-60.3.0/build.rs:63
[INFO] [stderr]    9:     0x563de59fb39a - core::ops::function::FnOnce::call_once::heda2d3e758702074
[INFO] [stderr]                                at /rustc/af22dfc7f56a5057c6b6120a65c74e7b6c1530af/src/libcore/ops/function.rs:231
[INFO] [stderr]   10:     0x563de59ff932 - lazy_static::lazy::Lazy<T>::get::{{closure}}::h6116c9164bf87795
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.3.0/src/inline_lazy.rs:28
[INFO] [stderr]   11:     0x563de59f9b8b - std::sync::once::Once::call_once::{{closure}}::h330a08d98343509e
[INFO] [stderr]                                at /rustc/af22dfc7f56a5057c6b6120a65c74e7b6c1530af/src/libstd/sync/once.rs:220
[INFO] [stderr]   12:     0x563de5c51c76 - std::sync::once::Once::call_inner::h677dc0ff90b355a2
[INFO] [stderr]                                at src/libstd/sync/once.rs:387
[INFO] [stderr]   13:     0x563de59f9add - std::sync::once::Once::call_once::hffc6d590d2e816a4
[INFO] [stderr]                                at /rustc/af22dfc7f56a5057c6b6120a65c74e7b6c1530af/src/libstd/sync/once.rs:220
[INFO] [stderr]   14:     0x563de59f7132 - lazy_static::lazy::Lazy<T>::get::h6318f5e37468b17d
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.3.0/src/inline_lazy.rs:27
[INFO] [stderr]   15:     0x563de59f7132 - <build_script_build::LLVM_CONFIG_PATH as core::ops::deref::Deref>::deref::__stability::h249df6e5c9bcd600
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/llvm-sys-60.3.0/<::lazy_static::__lazy_static_internal macros>:12
[INFO] [stderr]   16:     0x563de59f7132 - <build_script_build::LLVM_CONFIG_PATH as core::ops::deref::Deref>::deref::h3321dcf912bf2265
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/llvm-sys-60.3.0/<::lazy_static::__lazy_static_internal macros>:13
[INFO] [stderr]   17:     0x563de59f498a - build_script_build::llvm_config::h6f05aeba996bb5a8
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/llvm-sys-60.3.0/build.rs:150
[INFO] [stderr]   18:     0x563de59f60a0 - build_script_build::get_llvm_cflags::h5e1142693ac6a85f
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/llvm-sys-60.3.0/build.rs:259
[INFO] [stderr]   19:     0x563de59f649e - build_script_build::main::ha6d516720007e96a
[INFO] [stderr]                                at /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/llvm-sys-60.3.0/build.rs:284
[INFO] [stderr]   20:     0x563de59fdb30 - std::rt::lang_start::{{closure}}::h52e66935f16f65fc
[INFO] [stderr]                                at /rustc/af22dfc7f56a5057c6b6120a65c74e7b6c1530af/src/libstd/rt.rs:64
[INFO] [stderr]   21:     0x563de5c54a73 - std::rt::lang_start_internal::{{closure}}::h3433d02b763cc1cc
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   22:     0x563de5c54a73 - std::panicking::try::do_call::h1bd2814d0b730969
[INFO] [stderr]                                at src/libstd/panicking.rs:294
[INFO] [stderr]   23:     0x563de5c5d6ba - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:85
[INFO] [stderr]   24:     0x563de5c5557d - std::panicking::try::hf899646d63b90b29
[INFO] [stderr]                                at src/libstd/panicking.rs:273
[INFO] [stderr]   25:     0x563de5c5557d - std::panic::catch_unwind::ha1af529349fbe3dc
[INFO] [stderr]                                at src/libstd/panic.rs:388
[INFO] [stderr]   26:     0x563de5c5557d - std::rt::lang_start_internal::he5b58aa1d492830f
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   27:     0x563de59fdb09 - std::rt::lang_start::h4315351e9f6c28ba
[INFO] [stderr]                                at /rustc/af22dfc7f56a5057c6b6120a65c74e7b6c1530af/src/libstd/rt.rs:64
[INFO] [stderr]   28:     0x563de59f71ca - main
[INFO] [stderr]   29:     0x7f5b9ae492e1 - __libc_start_main
[INFO] [stderr]   30:     0x563de59f371a - _start
[INFO] [stderr]   31:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "93700ecb971650b94eed2ee4ff8a3386f4b3020a2f1f6ef2a94f4c523def455e"`
[INFO] running `"docker" "rm" "-f" "93700ecb971650b94eed2ee4ff8a3386f4b3020a2f1f6ef2a94f4c523def455e"`
[INFO] [stdout] 93700ecb971650b94eed2ee4ff8a3386f4b3020a2f1f6ef2a94f4c523def455e