[INFO] cloning repository https://github.com/adrianclay/rust_roman_numerals
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/adrianclay/rust_roman_numerals" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadrianclay%2Frust_roman_numerals", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadrianclay%2Frust_roman_numerals'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1e09ff1f9356ab488511b3d198324967ce690d23
[INFO] checking adrianclay/rust_roman_numerals against try#560667b800e34f03ac9f520f299d077c249dd301 for pr-100971
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadrianclay%2Frust_roman_numerals" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/adrianclay/rust_roman_numerals on toolchain 560667b800e34f03ac9f520f299d077c249dd301
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+560667b800e34f03ac9f520f299d077c249dd301" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/adrianclay/rust_roman_numerals
[INFO] finished tweaking git repo https://github.com/adrianclay/rust_roman_numerals
[INFO] tweaked toml for git repo https://github.com/adrianclay/rust_roman_numerals written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/adrianclay/rust_roman_numerals already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+560667b800e34f03ac9f520f299d077c249dd301" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+560667b800e34f03ac9f520f299d077c249dd301" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 88949029aaebede70a4e444f3794066defb380c2d8f3412e7133fbcf85dd7183
[INFO] running `Command { std: "docker" "start" "-a" "88949029aaebede70a4e444f3794066defb380c2d8f3412e7133fbcf85dd7183", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88949029aaebede70a4e444f3794066defb380c2d8f3412e7133fbcf85dd7183", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88949029aaebede70a4e444f3794066defb380c2d8f3412e7133fbcf85dd7183", kill_on_drop: false }`
[INFO] [stdout] 88949029aaebede70a4e444f3794066defb380c2d8f3412e7133fbcf85dd7183
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:824c28ce115f6b999260af6986f3384c158e782489540e41c0b698ca1d9fd927" "/opt/rustwide/cargo-home/bin/cargo" "+560667b800e34f03ac9f520f299d077c249dd301" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 897fee1b8b98bf181f055159409c5942ba23f66f09d90f5774f11381c169890c
[INFO] running `Command { std: "docker" "start" "-a" "897fee1b8b98bf181f055159409c5942ba23f66f09d90f5774f11381c169890c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling getrandom v0.1.12
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr] error: failed to run custom build command for `libc v0.2.62`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/libc-b9c2453a78fe72eb/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'Failed to get rustc version', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.62/build.rs:7:31
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x56386235a180 - std::backtrace_rs::backtrace::libunwind::trace::hbb3993e407686285
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      1:     0x56386235a180 - std::backtrace_rs::backtrace::trace_unsynchronized::h2b06659c943a09f0
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x56386235a180 - std::sys_common::backtrace::_print_fmt::h676962b0162f62e5
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/sys_common/backtrace.rs:66:5
[INFO] [stderr]      3:     0x56386235a180 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::ha0d2ba78543a109f
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/sys_common/backtrace.rs:45:22
[INFO] [stderr]      4:     0x56386237743e - core::fmt::write::hc9a543a2c46ce767
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/fmt/mod.rs:1202:17
[INFO] [stderr]      5:     0x563862357485 - std::io::Write::write_fmt::h1be311b310a4aa80
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/io/mod.rs:1672:15
[INFO] [stderr]      6:     0x56386235b8d3 - std::sys_common::backtrace::_print::h5d3c46e4ca69cc60
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/sys_common/backtrace.rs:48:5
[INFO] [stderr]      7:     0x56386235b8d3 - std::sys_common::backtrace::print::h958100729cb4758a
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/sys_common/backtrace.rs:35:9
[INFO] [stderr]      8:     0x56386235b8d3 - std::panicking::default_hook::{{closure}}::hab051022779338dd
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:295:22
[INFO] [stderr]      9:     0x56386235b5bf - std::panicking::default_hook::hc6ea4e908ee8a453
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:314:9
[INFO] [stderr]     10:     0x56386235bf7a - std::panicking::rust_panic_with_hook::h962c972a051a8f7a
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:698:17
[INFO] [stderr]     11:     0x56386235be77 - std::panicking::begin_panic_handler::{{closure}}::hfa5798e5fe6b3140
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:588:13
[INFO] [stderr]     12:     0x56386235a69c - std::sys_common::backtrace::__rust_end_short_backtrace::h7b7fe4e090b3ee08
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/sys_common/backtrace.rs:138:18
[INFO] [stderr]     13:     0x56386235bb92 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:584:5
[INFO] [stderr]     14:     0x5638623369c3 - core::panicking::panic_fmt::h0edf611a3244aa6c
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/panicking.rs:142:14
[INFO] [stderr]     15:     0x563862376631 - core::panicking::panic_display::hc52278b0e1184cd1
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/panicking.rs:72:5
[INFO] [stderr]     16:     0x5638623765db - core::panicking::panic_str::hc7f0a7d91d51b830
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/panicking.rs:56:5
[INFO] [stderr]     17:     0x563862336836 - core::option::expect_failed::h4f6a348ef998636d
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/option.rs:1880:5
[INFO] [stderr]     18:     0x56386233a63a - core::option::Option<T>::expect::h54bc9ad29f8660f5
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/option.rs:738:21
[INFO] [stderr]     19:     0x56386233ee74 - build_script_build::main::h06fb7fec7f20a040
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.62/build.rs:7:9
[INFO] [stderr]     20:     0x56386233d04b - core::ops::function::FnOnce::call_once::hf8c3c8d7a8747625
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/ops/function.rs:248:5
[INFO] [stderr]     21:     0x5638623392fe - std::sys_common::backtrace::__rust_begin_short_backtrace::h2eee7cc421cfd58d
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/sys_common/backtrace.rs:122:18
[INFO] [stderr]     22:     0x563862339ff1 - std::rt::lang_start::{{closure}}::h28d01229a8d906f0
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/rt.rs:145:18
[INFO] [stderr]     23:     0x5638623549bf - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h374a34ab80724658
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/core/src/ops/function.rs:280:13
[INFO] [stderr]     24:     0x5638623549bf - std::panicking::try::do_call::hc1ae46ee68e81ae9
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:492:40
[INFO] [stderr]     25:     0x5638623549bf - std::panicking::try::h5be49582b3c7dc86
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:456:19
[INFO] [stderr]     26:     0x5638623549bf - std::panic::catch_unwind::h7cc24fcf946358e1
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panic.rs:137:14
[INFO] [stderr]     27:     0x5638623549bf - std::rt::lang_start_internal::{{closure}}::hb106321bea8e7094
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/rt.rs:128:48
[INFO] [stderr]     28:     0x5638623549bf - std::panicking::try::do_call::h1a35fe83f2392db7
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:492:40
[INFO] [stderr]     29:     0x5638623549bf - std::panicking::try::h14deeca5121ff374
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panicking.rs:456:19
[INFO] [stderr]     30:     0x5638623549bf - std::panic::catch_unwind::h3b0cdc8b3ed01f99
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/panic.rs:137:14
[INFO] [stderr]     31:     0x5638623549bf - std::rt::lang_start_internal::hcbf2a7bc04af812f
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/rt.rs:128:20
[INFO] [stderr]     32:     0x563862339fc0 - std::rt::lang_start::hc6ef19b8d94ebbd4
[INFO] [stderr]                                  at /rustc/560667b800e34f03ac9f520f299d077c249dd301/library/std/src/rt.rs:144:17
[INFO] [stderr]     33:     0x56386233fefc - main
[INFO] [stderr]     34:     0x7f5666387083 - __libc_start_main
[INFO] [stderr]     35:     0x563862336bbe - _start
[INFO] [stderr]     36:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "897fee1b8b98bf181f055159409c5942ba23f66f09d90f5774f11381c169890c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "897fee1b8b98bf181f055159409c5942ba23f66f09d90f5774f11381c169890c", kill_on_drop: false }`
[INFO] [stdout] 897fee1b8b98bf181f055159409c5942ba23f66f09d90f5774f11381c169890c