[INFO] cloning repository https://github.com/XciD/descriptor
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/XciD/descriptor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXciD%2Fdescriptor", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXciD%2Fdescriptor'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f7d2f3cc421c0f009958dee645275e9cf4a1a550
[INFO] checking XciD/descriptor against try#66a90ebb65988141d56cac36290f07711b1b1e2d for pr-104616
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXciD%2Fdescriptor" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/XciD/descriptor on toolchain 66a90ebb65988141d56cac36290f07711b1b1e2d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66a90ebb65988141d56cac36290f07711b1b1e2d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/XciD/descriptor
[INFO] finished tweaking git repo https://github.com/XciD/descriptor
[INFO] tweaked toml for git repo https://github.com/XciD/descriptor written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/XciD/descriptor already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66a90ebb65988141d56cac36290f07711b1b1e2d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:bb5b0feb4f87116a4ea905b7ff5bf5b85913db05e9f0fbc1abdd3168928d9075" "/opt/rustwide/cargo-home/bin/cargo" "+66a90ebb65988141d56cac36290f07711b1b1e2d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 30c06cc19624e74f904e4c0a7f6ad1209d2efe1fc79f106bdf3bcd9fac398872
[INFO] running `Command { std: "docker" "start" "-a" "30c06cc19624e74f904e4c0a7f6ad1209d2efe1fc79f106bdf3bcd9fac398872", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "30c06cc19624e74f904e4c0a7f6ad1209d2efe1fc79f106bdf3bcd9fac398872", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30c06cc19624e74f904e4c0a7f6ad1209d2efe1fc79f106bdf3bcd9fac398872", kill_on_drop: false }`
[INFO] [stdout] 30c06cc19624e74f904e4c0a7f6ad1209d2efe1fc79f106bdf3bcd9fac398872
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:bb5b0feb4f87116a4ea905b7ff5bf5b85913db05e9f0fbc1abdd3168928d9075" "/opt/rustwide/cargo-home/bin/cargo" "+66a90ebb65988141d56cac36290f07711b1b1e2d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2329efd3bfb58be2b7f89f3eb28013a5f9d8bbd684d8f6eca6623e1c7f52b5f4
[INFO] running `Command { std: "docker" "start" "-a" "2329efd3bfb58be2b7f89f3eb28013a5f9d8bbd684d8f6eca6623e1c7f52b5f4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking utf8parse v0.2.0
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr] error: failed to run custom build command for `proc-macro-error v1.0.4`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/proc-macro-error-1cc339378bfd8f87/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:rustc-cfg=use_fallback
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro-error-1.0.4/build.rs:7:44
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x55e18a4dc720 - std::backtrace_rs::backtrace::libunwind::trace::h6e19814b4a643d61
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
[INFO] [stderr]      1:     0x55e18a4dc720 - std::backtrace_rs::backtrace::trace_unsynchronized::h68c1c52feb50cf1c
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x55e18a4dc720 - std::sys_common::backtrace::_print_fmt::ha1f058fd0a732244
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/sys_common/backtrace.rs:65:5
[INFO] [stderr]      3:     0x55e18a4dc720 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h28796d0ff6afe0f6
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stderr]      4:     0x55e18a4f99ce - core::fmt::write::hfee7452f6d0af6d0
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/core/src/fmt/mod.rs:1208:17
[INFO] [stderr]      5:     0x55e18a4d9ce5 - std::io::Write::write_fmt::h37a8cf2922b3a01b
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/io/mod.rs:1682:15
[INFO] [stderr]      6:     0x55e18a4dc4e5 - std::sys_common::backtrace::_print::h596f2a1bebccc8dd
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stderr]      7:     0x55e18a4dc4e5 - std::sys_common::backtrace::print::h53ae9baa224c59ab
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stderr]      8:     0x55e18a4ddb2f - std::panicking::default_hook::{{closure}}::h07238a9a90067e6a
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:267:22
[INFO] [stderr]      9:     0x55e18a4dd86a - std::panicking::default_hook::h4d541074f0e2c365
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:286:9
[INFO] [stderr]     10:     0x55e18a4de22c - std::panicking::rust_panic_with_hook::he9a9da3e8fa18fc2
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:688:13
[INFO] [stderr]     11:     0x55e18a4ddf81 - std::panicking::begin_panic_handler::{{closure}}::h5133679ed2524f54
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:577:13
[INFO] [stderr]     12:     0x55e18a4dcbcc - std::sys_common::backtrace::__rust_end_short_backtrace::hdb49be8d0a61a024
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/sys_common/backtrace.rs:137:18
[INFO] [stderr]     13:     0x55e18a4ddce2 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:575:5
[INFO] [stderr]     14:     0x55e18a4ac1c3 - core::panicking::panic_fmt::h0df9d8742cce2c6d
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/core/src/panicking.rs:65:14
[INFO] [stderr]     15:     0x55e18a4ac29d - core::panicking::panic::hce180bdf306748b8
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/core/src/panicking.rs:114:5
[INFO] [stderr]     16:     0x55e18a4ac830 - core::option::Option<T>::unwrap::he217097d99d0f4d9
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/core/src/option.rs:778:21
[INFO] [stderr]     17:     0x55e18a4ac64e - build_script_build::main::h587fe04cc39672f9
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro-error-1.0.4/build.rs:7:13
[INFO] [stderr]     18:     0x55e18a4ac8ab - core::ops::function::FnOnce::call_once::hc65082babc163344
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/core/src/ops/function.rs:507:5
[INFO] [stderr]     19:     0x55e18a4ac8ce - std::sys_common::backtrace::__rust_begin_short_backtrace::ha2edba1c1dbe341c
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/sys_common/backtrace.rs:121:18
[INFO] [stderr]     20:     0x55e18a4ac941 - std::rt::lang_start::{{closure}}::hb7b8142aa013333a
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/rt.rs:166:18
[INFO] [stderr]     21:     0x55e18a4d708c - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hbca72c3be19ccbd4
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/core/src/ops/function.rs:606:13
[INFO] [stderr]     22:     0x55e18a4d708c - std::panicking::try::do_call::h906fe64a4e5fabc3
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:483:40
[INFO] [stderr]     23:     0x55e18a4d708c - std::panicking::try::ha0352638fa5c430f
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:447:19
[INFO] [stderr]     24:     0x55e18a4d708c - std::panic::catch_unwind::he3b266bba4acb511
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panic.rs:137:14
[INFO] [stderr]     25:     0x55e18a4d708c - std::rt::lang_start_internal::{{closure}}::h177ffb10202722f6
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/rt.rs:148:48
[INFO] [stderr]     26:     0x55e18a4d708c - std::panicking::try::do_call::hf2596bc808a1e564
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:483:40
[INFO] [stderr]     27:     0x55e18a4d708c - std::panicking::try::h701d9d08f21b67df
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panicking.rs:447:19
[INFO] [stderr]     28:     0x55e18a4d708c - std::panic::catch_unwind::haf8b82143ca6f508
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/panic.rs:137:14
[INFO] [stderr]     29:     0x55e18a4d708c - std::rt::lang_start_internal::h39c930f836da0315
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/rt.rs:148:20
[INFO] [stderr]     30:     0x55e18a4ac91a - std::rt::lang_start::h57a217544824a5e6
[INFO] [stderr]                                  at /rustc/66a90ebb65988141d56cac36290f07711b1b1e2d/library/std/src/rt.rs:165:17
[INFO] [stderr]     31:     0x55e18a4ac6ce - main
[INFO] [stderr]     32:     0x7f321aba0083 - __libc_start_main
[INFO] [stderr]     33:     0x55e18a4ac50e - _start
[INFO] [stderr]     34:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "2329efd3bfb58be2b7f89f3eb28013a5f9d8bbd684d8f6eca6623e1c7f52b5f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2329efd3bfb58be2b7f89f3eb28013a5f9d8bbd684d8f6eca6623e1c7f52b5f4", kill_on_drop: false }`
[INFO] [stdout] 2329efd3bfb58be2b7f89f3eb28013a5f9d8bbd684d8f6eca6623e1c7f52b5f4