[INFO] fetching crate promising-future 0.2.4...
[INFO] testing promising-future-0.2.4 against try#015dbcea68b7642e2acc268b5c8f3e9086fc02ff for pr-102570
[INFO] extracting crate promising-future 0.2.4 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate promising-future 0.2.4 on toolchain 015dbcea68b7642e2acc268b5c8f3e9086fc02ff
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+015dbcea68b7642e2acc268b5c8f3e9086fc02ff" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate promising-future 0.2.4
[INFO] finished tweaking crates.io crate promising-future 0.2.4
[INFO] tweaked toml for crates.io crate promising-future 0.2.4 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+015dbcea68b7642e2acc268b5c8f3e9086fc02ff" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+015dbcea68b7642e2acc268b5c8f3e9086fc02ff" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+015dbcea68b7642e2acc268b5c8f3e9086fc02ff" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a773aad670d23659e1aab01be73776260a0a9e4acfad3366c4ef0d48bf5f17e2
[INFO] running `Command { std: "docker" "start" "-a" "a773aad670d23659e1aab01be73776260a0a9e4acfad3366c4ef0d48bf5f17e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a773aad670d23659e1aab01be73776260a0a9e4acfad3366c4ef0d48bf5f17e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a773aad670d23659e1aab01be73776260a0a9e4acfad3366c4ef0d48bf5f17e2", kill_on_drop: false }`
[INFO] [stdout] a773aad670d23659e1aab01be73776260a0a9e4acfad3366c4ef0d48bf5f17e2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+015dbcea68b7642e2acc268b5c8f3e9086fc02ff" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b397d7bac27f905d6ffd46ed9c3cd5ddb8c30824505011a24db5b0bdfe14a250
[INFO] running `Command { std: "docker" "start" "-a" "b397d7bac27f905d6ffd46ed9c3cd5ddb8c30824505011a24db5b0bdfe14a250", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr] error: failed to run custom build command for `libc v0.2.137`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/libc-de9ae1dce6a72901/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:rerun-if-changed=build.rs
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'Failed to get rustc version', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.137/build.rs:9:63
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x559e00e6aba0 - std::backtrace_rs::backtrace::libunwind::trace::hecb21857e99d889d
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
[INFO] [stderr]      1:     0x559e00e6aba0 - std::backtrace_rs::backtrace::trace_unsynchronized::h390569d291d382e6
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x559e00e6aba0 - std::sys_common::backtrace::_print_fmt::he268a904f7419e52
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/sys_common/backtrace.rs:65:5
[INFO] [stderr]      3:     0x559e00e6aba0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hedbee76c21719161
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stderr]      4:     0x559e00e87c9e - core::fmt::write::hd7abf800172f9326
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/fmt/mod.rs:1209:17
[INFO] [stderr]      5:     0x559e00e68155 - std::io::Write::write_fmt::h16feca50b93a3788
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/io/mod.rs:1682:15
[INFO] [stderr]      6:     0x559e00e6a965 - std::sys_common::backtrace::_print::he1bf0c0215d8eb21
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stderr]      7:     0x559e00e6a965 - std::sys_common::backtrace::print::h1d63cc8fb6910f4d
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stderr]      8:     0x559e00e6c04f - std::panicking::default_hook::{{closure}}::h06165285990169e4
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:267:22
[INFO] [stderr]      9:     0x559e00e6bd8a - std::panicking::default_hook::hc8c52a6a2d770858
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:286:9
[INFO] [stderr]     10:     0x559e00e6c74c - std::panicking::rust_panic_with_hook::h4b7f78aa6e886a78
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:688:13
[INFO] [stderr]     11:     0x559e00e6c4e7 - std::panicking::begin_panic_handler::{{closure}}::h8c929b88c5c37601
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:579:13
[INFO] [stderr]     12:     0x559e00e6b04c - std::sys_common::backtrace::__rust_end_short_backtrace::h61d4e5f81197e3cc
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/sys_common/backtrace.rs:137:18
[INFO] [stderr]     13:     0x559e00e6c202 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:575:5
[INFO] [stderr]     14:     0x559e00e44083 - core::panicking::panic_fmt::hd23e6f8c5d094f51
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/panicking.rs:65:14
[INFO] [stderr]     15:     0x559e00e86f41 - core::panicking::panic_display::h0324a09440f9fd22
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/panicking.rs:139:5
[INFO] [stderr]     16:     0x559e00e86eeb - core::panicking::panic_str::h2125cf834f656e25
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/panicking.rs:123:5
[INFO] [stderr]     17:     0x559e00e44046 - core::option::expect_failed::h578269a4412e5a5c
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/option.rs:1879:5
[INFO] [stderr]     18:     0x559e00e4e119 - core::option::Option<T>::expect::h1427af675d2f8919
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/option.rs:741:21
[INFO] [stderr]     19:     0x559e00e492b4 - build_script_build::main::h2e6738951d241221
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.137/build.rs:9:41
[INFO] [stderr]     20:     0x559e00e4cc9b - core::ops::function::FnOnce::call_once::h8d96e0de40ee9489
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/ops/function.rs:510:5
[INFO] [stderr]     21:     0x559e00e4d9de - std::sys_common::backtrace::__rust_begin_short_backtrace::heb50d3707e15ce23
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/sys_common/backtrace.rs:121:18
[INFO] [stderr]     22:     0x559e00e466d1 - std::rt::lang_start::{{closure}}::hc10833af95fa8692
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/rt.rs:166:18
[INFO] [stderr]     23:     0x559e00e655ab - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h0beb6046e0e1b0d6
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/core/src/ops/function.rs:606:13
[INFO] [stderr]     24:     0x559e00e655ab - std::panicking::try::do_call::h1b8f4d53cf610004
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:483:40
[INFO] [stderr]     25:     0x559e00e655ab - std::panicking::try::hdf67621b4ed8fc84
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:447:19
[INFO] [stderr]     26:     0x559e00e655ab - std::panic::catch_unwind::h826d87a07f972d58
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panic.rs:137:14
[INFO] [stderr]     27:     0x559e00e655ab - std::rt::lang_start_internal::{{closure}}::h50999eb1f27c8af6
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/rt.rs:148:48
[INFO] [stderr]     28:     0x559e00e655ab - std::panicking::try::do_call::h99edc9a10996101f
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:483:40
[INFO] [stderr]     29:     0x559e00e655ab - std::panicking::try::hd9a2916c5d22ab14
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panicking.rs:447:19
[INFO] [stderr]     30:     0x559e00e655ab - std::panic::catch_unwind::h8b5b4c3a984837c2
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/panic.rs:137:14
[INFO] [stderr]     31:     0x559e00e655ab - std::rt::lang_start_internal::hec3daba3a267c82e
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/rt.rs:148:20
[INFO] [stderr]     32:     0x559e00e466aa - std::rt::lang_start::hd53847180c21465f
[INFO] [stderr]                                  at /rustc/015dbcea68b7642e2acc268b5c8f3e9086fc02ff/library/std/src/rt.rs:165:17
[INFO] [stderr]     33:     0x559e00e4aa7e - main
[INFO] [stderr]     34:     0x7ff24a04f083 - __libc_start_main
[INFO] [stderr]     35:     0x559e00e443ce - _start
[INFO] [stderr]     36:                0x0 - <unknown>
[INFO] running `Command { std: "docker" "inspect" "b397d7bac27f905d6ffd46ed9c3cd5ddb8c30824505011a24db5b0bdfe14a250", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b397d7bac27f905d6ffd46ed9c3cd5ddb8c30824505011a24db5b0bdfe14a250", kill_on_drop: false }`
[INFO] [stdout] b397d7bac27f905d6ffd46ed9c3cd5ddb8c30824505011a24db5b0bdfe14a250