[INFO] fetching crate cntk 0.2.1...
[INFO] checking cntk-0.2.1 against beta for pr-78714
[INFO] extracting crate cntk 0.2.1 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate cntk 0.2.1 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cntk 0.2.1
[INFO] finished tweaking crates.io crate cntk 0.2.1
[INFO] tweaked toml for crates.io crate cntk 0.2.1 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 734d1ad309b49a4470a4af2e1144f8a13f0d82a9d0b8a2eba8a99d5bb4424d7a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "734d1ad309b49a4470a4af2e1144f8a13f0d82a9d0b8a2eba8a99d5bb4424d7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "734d1ad309b49a4470a4af2e1144f8a13f0d82a9d0b8a2eba8a99d5bb4424d7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "734d1ad309b49a4470a4af2e1144f8a13f0d82a9d0b8a2eba8a99d5bb4424d7a", kill_on_drop: false }`
[INFO] [stdout] 734d1ad309b49a4470a4af2e1144f8a13f0d82a9d0b8a2eba8a99d5bb4424d7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bbb2c98a723367f3727fc95f32c6f53515368c9962f9a78b821494b48332fe15
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bbb2c98a723367f3727fc95f32c6f53515368c9962f9a78b821494b48332fe15", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling matrixmultiply v0.1.15
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]     Checking rawpointer v0.1.0
[INFO] [stderr]    Compiling ndarray v0.10.14
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking mnist v0.4.1
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]    Compiling cpp_synom v0.12.0
[INFO] [stderr]    Compiling aho-corasick v0.6.10
[INFO] [stderr]    Compiling cpp_syn v0.12.0
[INFO] [stderr]    Compiling memchr v1.0.2
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]    Compiling cpp_common v0.3.2
[INFO] [stderr]    Compiling cpp_synmap v0.3.0
[INFO] [stderr]    Compiling cpp_build v0.3.2
[INFO] [stderr]    Compiling cpp_macros v0.3.2
[INFO] [stderr]    Compiling cntk v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking cpp v0.3.2
[INFO] [stderr] error: failed to run custom build command for `cntk v0.2.1 (/opt/rustwide/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/cntk-ce8c6660bf7ee603/build-script-build` (exit code: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   TARGET = Some("x86_64-unknown-linux-gnu")
[INFO] [stderr]   OPT_LEVEL = Some("0")
[INFO] [stderr]   TARGET = Some("x86_64-unknown-linux-gnu")
[INFO] [stderr]   TARGET = Some("x86_64-unknown-linux-gnu")
[INFO] [stderr]   HOST = Some("x86_64-unknown-linux-gnu")
[INFO] [stderr]   CXXFLAGS_x86_64-unknown-linux-gnu = None
[INFO] [stderr]   CXXFLAGS_x86_64_unknown_linux_gnu = None
[INFO] [stderr]   HOST_CXXFLAGS = None
[INFO] [stderr]   CXXFLAGS = None
[INFO] [stderr]   DEBUG = Some("true")
[INFO] [stderr]   running: "g++-4.8" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-m64" "-I" "/opt/rustwide/workdir" "-std=c++11" "-Wall" "-Wextra" "-o" "/opt/rustwide/target/debug/build/cntk-8f7ac05d6b3b0643/out/rust_cpp/cpp_closures.o" "-c" "/opt/rustwide/target/debug/build/cntk-8f7ac05d6b3b0643/out/rust_cpp/cpp_closures.cpp"
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at '
[INFO] [stderr] 
[INFO] [stderr]   Internal error occurred: Failed to find tool. Is `g++-4.8` installed?
[INFO] [stderr] 
[INFO] [stderr]   ', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/gcc-0.3.55/src/lib.rs:1672:5
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55f1a2829690 - std::backtrace_rs::backtrace::libunwind::trace::h7cf3ca97bd83fbab
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
[INFO] [stderr]      1:     0x55f1a2829690 - std::backtrace_rs::backtrace::trace_unsynchronized::h5a69c674b2d9ea5c
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/../../backtrace/src/backtrace/mod.rs:66
[INFO] [stderr]      2:     0x55f1a2829690 - std::sys_common::backtrace::_print_fmt::hdf72478dfcb50678
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/sys_common/backtrace.rs:79
[INFO] [stderr]      3:     0x55f1a2829690 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1e0bdbb35e83deca
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/sys_common/backtrace.rs:58
[INFO] [stderr]      4:     0x55f1a28495ac - core::fmt::write::he67f9b17bcb7ee73
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/core/src/fmt/mod.rs:1080
[INFO] [stderr]      5:     0x55f1a2825722 - std::io::Write::write_fmt::hac97d5cb5753e2ec
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/io/mod.rs:1516
[INFO] [stderr]      6:     0x55f1a282bf1d - std::sys_common::backtrace::_print::haa20918e28a126c5
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/sys_common/backtrace.rs:61
[INFO] [stderr]      7:     0x55f1a282bf1d - std::sys_common::backtrace::print::h49e772a4873d9076
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/sys_common/backtrace.rs:48
[INFO] [stderr]      8:     0x55f1a282bf1d - std::panicking::default_hook::{{closure}}::hb218b305d15e3f11
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:208
[INFO] [stderr]      9:     0x55f1a282bbc8 - std::panicking::default_hook::h63997b7b949e1ce0
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:227
[INFO] [stderr]     10:     0x55f1a282c5a1 - std::panicking::rust_panic_with_hook::hb54f09ccadf64bd3
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:577
[INFO] [stderr]     11:     0x55f1a282c149 - std::panicking::begin_panic_handler::{{closure}}::h8b43445b254eeb30
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:484
[INFO] [stderr]     12:     0x55f1a2829b1c - std::sys_common::backtrace::__rust_end_short_backtrace::hacd691450edfeae0
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/sys_common/backtrace.rs:153
[INFO] [stderr]     13:     0x55f1a282c109 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:483
[INFO] [stderr]     14:     0x55f1a282c0bb - std::panicking::begin_panic_fmt::hef75366dd3a9de61
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:437
[INFO] [stderr]     15:     0x55f1a2605954 - gcc::fail::h848aef746e246696
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/gcc-0.3.55/src/lib.rs:1672
[INFO] [stderr]     16:     0x55f1a25f76fe - gcc::Build::compile::h1094188068d914a0
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/gcc-0.3.55/src/lib.rs:785
[INFO] [stderr]     17:     0x55f1a25e3e3f - cpp_build::Config::build::h38e7320e32720781
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/cpp_build-0.3.2/src/lib.rs:484
[INFO] [stderr]     18:     0x55f1a25e4f93 - build_script_build::main::h705308bcf7f8ecd1
[INFO] [stderr]                                  at /opt/rustwide/workdir/build.rs:6
[INFO] [stderr]     19:     0x55f1a25e518b - core::ops::function::FnOnce::call_once::h4e5bb5c2736fd9e2
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/core/src/ops/function.rs:227
[INFO] [stderr]     20:     0x55f1a25e424e - std::sys_common::backtrace::__rust_begin_short_backtrace::h387acb5c2979f2cf
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/sys_common/backtrace.rs:137
[INFO] [stderr]     21:     0x55f1a25e43d1 - std::rt::lang_start::{{closure}}::h1f4f0e68ed4c17d0
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/rt.rs:66
[INFO] [stderr]     22:     0x55f1a282c9c7 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h908982dfc31b926f
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/core/src/ops/function.rs:259
[INFO] [stderr]     23:     0x55f1a282c9c7 - std::panicking::try::do_call::h92777899503b7584
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:381
[INFO] [stderr]     24:     0x55f1a282c9c7 - std::panicking::try::h8815656b2b76e792
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panicking.rs:345
[INFO] [stderr]     25:     0x55f1a282c9c7 - std::panic::catch_unwind::h112ab81228f50b46
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/panic.rs:382
[INFO] [stderr]     26:     0x55f1a282c9c7 - std::rt::lang_start_internal::h1772a706c7575c24
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/rt.rs:51
[INFO] [stderr]     27:     0x55f1a25e43a7 - std::rt::lang_start::hb27eb4c338e70ebd
[INFO] [stderr]                                  at /rustc/1219014599fd873fcb640b675d8a662150c74e40/library/std/src/rt.rs:65
[INFO] [stderr]     28:     0x55f1a25e501a - main
[INFO] [stderr]     29:     0x7f53837d70b3 - __libc_start_main
[INFO] [stderr]     30:     0x55f1a25de0ce - _start
[INFO] [stderr]     31:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "bbb2c98a723367f3727fc95f32c6f53515368c9962f9a78b821494b48332fe15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbb2c98a723367f3727fc95f32c6f53515368c9962f9a78b821494b48332fe15", kill_on_drop: false }`
[INFO] [stdout] bbb2c98a723367f3727fc95f32c6f53515368c9962f9a78b821494b48332fe15