[INFO] crate core_io 0.1.20190701 is already in cache
[INFO] extracting crate core_io 0.1.20190701 into work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/reg/core_io/0.1.20190701
[INFO] extracting crate core_io 0.1.20190701 into work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/core_io/0.1.20190701
[INFO] validating manifest of core_io-0.1.20190701 on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of core_io-0.1.20190701 on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing core_io-0.1.20190701
[INFO] finished frobbing core_io-0.1.20190701
[INFO] frobbed toml for core_io-0.1.20190701 written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/reg/core_io/0.1.20190701/Cargo.toml
[INFO] started frobbing core_io-0.1.20190701
[INFO] finished frobbing core_io-0.1.20190701
[INFO] frobbed toml for core_io-0.1.20190701 written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/core_io/0.1.20190701/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking core_io-0.1.20190701 against try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-6/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/core_io/0.1.20190701:/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" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 13268768574b1bf3cdc22d82315ad2cc001e38ec9b6bf6adbc8f84ba1f8925d0
[INFO] running `"docker" "start" "-a" "13268768574b1bf3cdc22d82315ad2cc001e38ec9b6bf6adbc8f84ba1f8925d0"`
[INFO] [stderr]    Compiling core_io v0.1.20190701 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `core_io v0.1.20190701 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/core_io-4e510d719f6a8ff5/build-script-build` (exit code: 101)
[INFO] [stderr] --- stderr
[INFO] [stderr] thread 'main' panicked at 'Unknown compiler version, upgrade core_io?', src/libcore/option.rs:1166:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x55c5f9df86eb - backtrace::backtrace::libunwind::trace::h098b67cd5ecf24d4
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x55c5f9df86eb - backtrace::backtrace::trace_unsynchronized::h41f8ecb0b6b75123
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.34/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x55c5f9df86eb - std::sys_common::backtrace::_print::h6bdd5779472ab8c6
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x55c5f9df86eb - std::sys_common::backtrace::print::h535418cbcfd3b064
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x55c5f9df86eb - std::panicking::default_hook::{{closure}}::h8962ad5cd6daeea4
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x55c5f9df83c6 - std::panicking::default_hook::h39b428958abf2606
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x55c5f9df8dad - std::panicking::rust_panic_with_hook::hec5b145cd2b2dbe3
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x55c5f9df8932 - std::panicking::continue_panic_fmt::h499883e21d98c9ea
[INFO] [stderr]                                at src/libstd/panicking.rs:384
[INFO] [stderr]    8:     0x55c5f9df8816 - rust_begin_unwind
[INFO] [stderr]                                at src/libstd/panicking.rs:311
[INFO] [stderr]    9:     0x55c5f9e115ed - core::panicking::panic_fmt::hf925eb7f761dd347
[INFO] [stderr]                                at src/libcore/panicking.rs:85
[INFO] [stderr]   10:     0x55c5f9e11657 - core::option::expect_failed::h2acfa704fc0e0726
[INFO] [stderr]                                at src/libcore/option.rs:1166
[INFO] [stderr]   11:     0x55c5f9dcb56a - core::option::Option<T>::expect::hd58e0f5bf3268b83
[INFO] [stderr]                                at /rustc/757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/src/libcore/option.rs:345
[INFO] [stderr]   12:     0x55c5f9dc633b - build_script_build::main::hdf1daca27fa975a1
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:73
[INFO] [stderr]   13:     0x55c5f9dcbef0 - std::rt::lang_start::{{closure}}::hc87c50685bd02d50
[INFO] [stderr]                                at /rustc/757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/src/libstd/rt.rs:64
[INFO] [stderr]   14:     0x55c5f9df8803 - std::rt::lang_start_internal::{{closure}}::h1d5b2f63d8aab9e2
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   15:     0x55c5f9df8803 - std::panicking::try::do_call::h23b1282500223f6a
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   16:     0x55c5f9dfed9a - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:80
[INFO] [stderr]   17:     0x55c5f9df92bd - std::panicking::try::hf851d9cd2a46569f
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   18:     0x55c5f9df92bd - std::panic::catch_unwind::h38ad47fd47b8a319
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   19:     0x55c5f9df92bd - std::rt::lang_start_internal::h8489a7c3e11328c4
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   20:     0x55c5f9dcbec9 - std::rt::lang_start::hac6dc028c8dfa8ca
[INFO] [stderr]                                at /rustc/757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/src/libstd/rt.rs:64
[INFO] [stderr]   21:     0x55c5f9dc6eaa - main
[INFO] [stderr]   22:     0x7fc8f64552e1 - __libc_start_main
[INFO] [stderr]   23:     0x55c5f9dc3d1a - _start
[INFO] [stderr]   24:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "13268768574b1bf3cdc22d82315ad2cc001e38ec9b6bf6adbc8f84ba1f8925d0"`
[INFO] running `"docker" "rm" "-f" "13268768574b1bf3cdc22d82315ad2cc001e38ec9b6bf6adbc8f84ba1f8925d0"`
[INFO] [stdout] 13268768574b1bf3cdc22d82315ad2cc001e38ec9b6bf6adbc8f84ba1f8925d0