[INFO] cloning repository https://github.com/HappyDustbunny/fern
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/HappyDustbunny/fern" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHappyDustbunny%2Ffern", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHappyDustbunny%2Ffern'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c1269b509f8759110724eb87fadacd4081d82dae
[INFO] checking HappyDustbunny/fern against master#5a45ab9738330fb317d49e3594c2db5248b1e971 for pr-136303
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHappyDustbunny%2Ffern" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/HappyDustbunny/fern on toolchain 5a45ab9738330fb317d49e3594c2db5248b1e971
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/HappyDustbunny/fern
[INFO] finished tweaking git repo https://github.com/HappyDustbunny/fern
[INFO] tweaked toml for git repo https://github.com/HappyDustbunny/fern written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/HappyDustbunny/fern already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded objc_exception v0.1.1
[INFO] [stderr]   Downloaded vk-sys v0.4.0
[INFO] [stderr]   Downloaded half v1.3.0
[INFO] [stderr]   Downloaded backtrace v0.3.34
[INFO] [stderr]   Downloaded vulkano-win v0.13.0
[INFO] [stderr]   Downloaded cc v1.0.38
[INFO] [stderr]   Downloaded vulkano v0.13.0
[INFO] [stderr]   Downloaded instant v0.1.1
[INFO] [stderr]   Downloaded conrod_derive v0.66.0
[INFO] [stderr]   Downloaded blake2b_simd v0.5.6
[INFO] [stderr]   Downloaded openssl-sys v0.9.48
[INFO] [stderr]   Downloaded curl v0.4.22
[INFO] [stderr]   Downloaded noise v0.5.1
[INFO] [stderr]   Downloaded serde v1.0.98
[INFO] [stderr]   Downloaded image v0.21.2
[INFO] [stderr]   Downloaded getrandom v0.1.8
[INFO] [stderr]   Downloaded vulkano-shaders v0.13.0
[INFO] [stderr]   Downloaded crossbeam v0.5.0
[INFO] [stderr]   Downloaded conrod_core v0.66.0
[INFO] [stderr]   Downloaded serde_derive v1.0.98
[INFO] [stderr]   Downloaded shaderc v0.5.1
[INFO] [stderr]   Downloaded metal v0.13.1
[INFO] [stderr]   Downloaded daggy v0.5.0
[INFO] [stderr]   Downloaded conrod_winit v0.66.0
[INFO] [stderr]   Downloaded daggy v0.6.0
[INFO] [stderr]   Downloaded rust-argon2 v0.5.0
[INFO] [stderr]   Downloaded env_perm v0.1.3
[INFO] [stderr]   Downloaded moltenvk_deps v0.1.8
[INFO] [stderr]   Downloaded pennereq v0.3.0
[INFO] [stderr]   Downloaded cmake v0.1.41
[INFO] [stderr]   Downloaded crossbeam v0.7.2
[INFO] [stderr]   Downloaded piston-viewport v0.5.0
[INFO] [stderr]   Downloaded pistoncore-input v0.24.0
[INFO] [stderr]   Downloaded conrod_vulkano v0.66.0
[INFO] [stderr]   Downloaded nannou v0.10.0
[INFO] [stderr]   Downloaded curl-sys v0.4.20
[INFO] [stderr]   Downloaded shaderc-sys v0.5.1
[INFO] [stderr]   Downloaded pbr v1.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9c3601c1b69c59b98af364acd7db885986da2ccc0c7ff4985456894bd494a6af
[INFO] running `Command { std: "docker" "start" "-a" "9c3601c1b69c59b98af364acd7db885986da2ccc0c7ff4985456894bd494a6af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c3601c1b69c59b98af364acd7db885986da2ccc0c7ff4985456894bd494a6af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c3601c1b69c59b98af364acd7db885986da2ccc0c7ff4985456894bd494a6af", kill_on_drop: false }`
[INFO] [stdout] 9c3601c1b69c59b98af364acd7db885986da2ccc0c7ff4985456894bd494a6af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 572ad80e24d992a55ca24275cf69741e15c2701f6892159a16518cfccf8ebad5
[INFO] running `Command { std: "docker" "start" "-a" "572ad80e24d992a55ca24275cf69741e15c2701f6892159a16518cfccf8ebad5", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling cc v1.0.38
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling xml-rs v0.8.0
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking adler32 v1.0.3
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking linked-hash-map v0.5.2
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling cmake v0.1.41
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling wayland-scanner v0.21.13
[INFO] [stderr]     Checking stb_truetype v0.2.6
[INFO] [stderr]     Checking rustc-hash v1.0.1
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking lzw v0.10.0
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]     Checking deflate v0.7.20
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling shaderc-sys v0.5.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking crossbeam-deque v0.6.3
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking ordered-float v1.0.2
[INFO] [stderr]     Checking fixedbitset v0.1.9
[INFO] [stderr]     Checking same-file v1.0.5
[INFO] [stderr]     Checking color_quant v1.0.1
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking downcast-rs v1.0.4
[INFO] [stderr]     Checking rusttype v0.7.7
[INFO] [stderr]    Compiling pkg-config v0.3.15
[INFO] [stderr]     Checking walkdir v2.2.9
[INFO] [stderr]     Checking petgraph v0.4.13
[INFO] [stderr]     Checking line_drawing v0.7.0
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking dlib v0.4.1
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr] warning: shaderc-sys@0.5.1: Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr] warning: shaderc-sys@0.5.1: Pre-built library not found.  Falling back to from-source build
[INFO] [stderr] error: failed to run custom build command for `shaderc-sys v0.5.1`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/shaderc-sys-1044cb9536113503/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:warning=Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr]   cargo:warning=Pre-built library not found.  Falling back to from-source build
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr] 
[INFO] [stderr]   thread 'main' panicked at /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/shaderc-sys-0.5.1/build/cmd_finder.rs:45:13:
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr]   couldn't find required command: "python"
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x5a047d3f3940 - std::backtrace_rs::backtrace::libunwind::trace::h00ed8f7a49b23656
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
[INFO] [stderr]      1:     0x5a047d3f3940 - std::backtrace_rs::backtrace::trace_unsynchronized::hb9a616e2fc1d376f
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x5a047d3f3940 - std::sys::backtrace::_print_fmt::h7db298e83a256d29
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/sys/backtrace.rs:66:9
[INFO] [stderr]      3:     0x5a047d3f3940 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hd1ae340659526716
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/sys/backtrace.rs:39:26
[INFO] [stderr]      4:     0x5a047d417be3 - core::fmt::rt::Argument::fmt::hac01a348e20ee70d
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/core/src/fmt/rt.rs:177:76
[INFO] [stderr]      5:     0x5a047d417be3 - core::fmt::write::hc504a50407028ef6
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/core/src/fmt/mod.rs:1449:21
[INFO] [stderr]      6:     0x5a047d3eff03 - std::io::Write::write_fmt::ha00ae9415040e09a
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/io/mod.rs:1890:15
[INFO] [stderr]      7:     0x5a047d3f3792 - std::sys::backtrace::BacktraceLock::print::h6f3c8a163b5a5ba5
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/sys/backtrace.rs:42:9
[INFO] [stderr]      8:     0x5a047d3f491f - std::panicking::default_hook::{{closure}}::h4661160df59af739
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:298:22
[INFO] [stderr]      9:     0x5a047d3f478a - std::panicking::default_hook::h79b0b0cb5c9a45eb
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:325:9
[INFO] [stderr]     10:     0x5a047d3f5302 - std::panicking::rust_panic_with_hook::he8f5885f4873cada
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:831:13
[INFO] [stderr]     11:     0x5a047d3f508a - std::panicking::begin_panic_handler::{{closure}}::hce5053f4756cff33
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:704:13
[INFO] [stderr]     12:     0x5a047d3f3e59 - std::sys::backtrace::__rust_end_short_backtrace::h634718bdeca7b4fe
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/sys/backtrace.rs:168:18
[INFO] [stderr]     13:     0x5a047d3f4d1d - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:695:5
[INFO] [stderr]     14:     0x5a047d416a50 - core::panicking::panic_fmt::h0e90de0256284326
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/core/src/panicking.rs:75:14
[INFO] [stderr]     15:     0x5a047d38bdbc - build_script_build::cmd_finder::CommandFinder::must_have::{{closure}}::h85156495bb50a949
[INFO] [stderr]     16:     0x5a047d389843 - core::option::Option<T>::unwrap_or_else::h2391f02c643d17f2
[INFO] [stderr]     17:     0x5a047d38bd3c - build_script_build::cmd_finder::CommandFinder::must_have::h797b1eae3d9a456c
[INFO] [stderr]     18:     0x5a047d38dfbb - build_script_build::main::h8ffcca3817e05847
[INFO] [stderr]     19:     0x5a047d389043 - core::ops::function::FnOnce::call_once::h3b04160fb0a49a81
[INFO] [stderr]     20:     0x5a047d388956 - std::sys::backtrace::__rust_begin_short_backtrace::h34b8d968aa0de82e
[INFO] [stderr]     21:     0x5a047d3888d9 - std::rt::lang_start::{{closure}}::h1e27cf1efda6a257
[INFO] [stderr]     22:     0x5a047d3ebdf0 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h1b551c6ace84f634
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/core/src/ops/function.rs:284:13
[INFO] [stderr]     23:     0x5a047d3ebdf0 - std::panicking::try::do_call::hcda773f48bd80f09
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:587:40
[INFO] [stderr]     24:     0x5a047d3ebdf0 - std::panicking::try::h225c38e862182721
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:550:19
[INFO] [stderr]     25:     0x5a047d3ebdf0 - std::panic::catch_unwind::h6eb4a99877840d20
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panic.rs:358:14
[INFO] [stderr]     26:     0x5a047d3ebdf0 - std::rt::lang_start_internal::{{closure}}::h64597ebca62f6e02
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/rt.rs:168:24
[INFO] [stderr]     27:     0x5a047d3ebdf0 - std::panicking::try::do_call::ha3630280e291428a
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:587:40
[INFO] [stderr]     28:     0x5a047d3ebdf0 - std::panicking::try::h13d8cfc120ae8ff3
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panicking.rs:550:19
[INFO] [stderr]     29:     0x5a047d3ebdf0 - std::panic::catch_unwind::h9b1225c928e48a40
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/panic.rs:358:14
[INFO] [stderr]     30:     0x5a047d3ebdf0 - std::rt::lang_start_internal::h27f44511957e98ab
[INFO] [stderr]                                  at /rustc/5a45ab9738330fb317d49e3594c2db5248b1e971/library/std/src/rt.rs:164:5
[INFO] [stderr]     31:     0x5a047d3888c1 - std::rt::lang_start::h91af14752aeededb
[INFO] [stderr]     32:     0x5a047d38ebe5 - main
[INFO] [stderr]     33:     0x7885fdf3cd90 - <unknown>
[INFO] [stderr]     34:     0x7885fdf3ce40 - __libc_start_main
[INFO] [stderr]     35:     0x5a047d388175 - _start
[INFO] [stderr]     36:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "572ad80e24d992a55ca24275cf69741e15c2701f6892159a16518cfccf8ebad5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "572ad80e24d992a55ca24275cf69741e15c2701f6892159a16518cfccf8ebad5", kill_on_drop: false }`
[INFO] [stdout] 572ad80e24d992a55ca24275cf69741e15c2701f6892159a16518cfccf8ebad5
