[INFO] cloning repository https://github.com/sinlov/rust_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sinlov/rust_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsinlov%2Frust_playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsinlov%2Frust_playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a83992f3c7464dd47f64c1723b8e8ece42c7df20
[INFO] checking sinlov/rust_playground against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsinlov%2Frust_playground" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sinlov/rust_playground on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sinlov/rust_playground
[INFO] finished tweaking git repo https://github.com/sinlov/rust_playground
[INFO] tweaked toml for git repo https://github.com/sinlov/rust_playground written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/sinlov/rust_playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cc43ef9e074585c9c756f854c7eb5d2f994e0af46cd7a58d8684dbe10d7453fe
[INFO] running `Command { std: "docker" "start" "-a" "cc43ef9e074585c9c756f854c7eb5d2f994e0af46cd7a58d8684dbe10d7453fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cc43ef9e074585c9c756f854c7eb5d2f994e0af46cd7a58d8684dbe10d7453fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc43ef9e074585c9c756f854c7eb5d2f994e0af46cd7a58d8684dbe10d7453fe", kill_on_drop: false }`
[INFO] [stdout] cc43ef9e074585c9c756f854c7eb5d2f994e0af46cd7a58d8684dbe10d7453fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ae47a46fbcc501e249f8292f2d07d6b136c2c1361a981d1bd0890964f8ccc41d
[INFO] running `Command { std: "docker" "start" "-a" "ae47a46fbcc501e249f8292f2d07d6b136c2c1361a981d1bd0890964f8ccc41d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]     Checking safemem v0.2.0
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking adler32 v1.0.3
[INFO] [stderr]     Checking chunked_transfer v0.3.1
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]     Checking ascii v0.8.7
[INFO] [stderr]    Compiling rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]     Checking unicode-normalization v0.1.8
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking crc32fast v1.2.0
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]     Checking twoway v0.1.8
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking gzip-header v0.3.0
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr] error: failed to run custom build command for `rust_playground v0.1.0 (/opt/rustwide/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/rust_playground-c8c48f4868783680/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'Read-only file system (os error 30)', build.rs:13:22
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x559d7911f820 - std::backtrace_rs::backtrace::libunwind::trace::h0197874f43e7190f
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stderr]      1:     0x559d7911f820 - std::backtrace_rs::backtrace::trace_unsynchronized::hfdfd566bbbda6f2d
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x559d7911f820 - std::sys_common::backtrace::_print_fmt::hb3b4707c15b032a1
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x559d7911f820 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::had1dceac8b072f88
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]      4:     0x559d79138d5c - core::fmt::write::h9a6d9c74526a6c1b
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/core/src/fmt/mod.rs:1117:17
[INFO] [stderr]      5:     0x559d7911e165 - std::io::Write::write_fmt::h05c3bb2bc83b8ed0
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/io/mod.rs:1667:15
[INFO] [stderr]      6:     0x559d79120f8b - std::sys_common::backtrace::_print::h10f0826b2a586b58
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]      7:     0x559d79120f8b - std::sys_common::backtrace::print::h0d4242fbd1ac3eb6
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]      8:     0x559d79120f8b - std::panicking::default_hook::{{closure}}::h275ead39fe8b8e2a
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:210:50
[INFO] [stderr]      9:     0x559d79120b00 - std::panicking::default_hook::h5505d4d90f5984d9
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:227:9
[INFO] [stderr]     10:     0x559d79121654 - std::panicking::rust_panic_with_hook::h2f8980d1d9fd4ca0
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:624:17
[INFO] [stderr]     11:     0x559d79121130 - std::panicking::begin_panic_handler::{{closure}}::hd87853ef7e40ae97
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:521:13
[INFO] [stderr]     12:     0x559d7911fd24 - std::sys_common::backtrace::__rust_end_short_backtrace::hcab167aa940694a2
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]     13:     0x559d79121099 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:517:5
[INFO] [stderr]     14:     0x559d7910e89b - std::panicking::begin_panic_fmt::hb22a56f1d7ee4f34
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:460:5
[INFO] [stderr]     15:     0x559d79110334 - build_script_build::main::hb1584b8e6d7d8273
[INFO] [stderr]                                  at /opt/rustwide/workdir/build.rs:13:22
[INFO] [stderr]     16:     0x559d7911079b - core::ops::function::FnOnce::call_once::h6849e593fa28d64a
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     17:     0x559d7911002e - std::sys_common::backtrace::__rust_begin_short_backtrace::ha1c117fce6a2016e
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stderr]     18:     0x559d79111791 - std::rt::lang_start::{{closure}}::h4219a7f62c7a9732
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/rt.rs:63:18
[INFO] [stderr]     19:     0x559d79121b5a - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h5e3bbb97afe2bb03
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     20:     0x559d79121b5a - std::panicking::try::do_call::h48c2d717cec4bdcb
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:403:40
[INFO] [stderr]     21:     0x559d79121b5a - std::panicking::try::h2a49bc215893bc14
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:367:19
[INFO] [stderr]     22:     0x559d79121b5a - std::panic::catch_unwind::h6d23b7c99550c7ff
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panic.rs:129:14
[INFO] [stderr]     23:     0x559d79121b5a - std::rt::lang_start_internal::{{closure}}::h251a0c0729f15896
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/rt.rs:45:48
[INFO] [stderr]     24:     0x559d79121b5a - std::panicking::try::do_call::h4830e784a9b9d1ad
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:403:40
[INFO] [stderr]     25:     0x559d79121b5a - std::panicking::try::h0427859d2ad3b3b9
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panicking.rs:367:19
[INFO] [stderr]     26:     0x559d79121b5a - std::panic::catch_unwind::h4079bfb63395be0f
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/panic.rs:129:14
[INFO] [stderr]     27:     0x559d79121b5a - std::rt::lang_start_internal::h408e9d26a25a1f08
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/rt.rs:45:20
[INFO] [stderr]     28:     0x559d79111760 - std::rt::lang_start::h15916e461dc53789
[INFO] [stderr]                                  at /rustc/8007b506ac5da629f223b755f5a5391edd5f6d01/library/std/src/rt.rs:62:5
[INFO] [stderr]     29:     0x559d7911040c - main
[INFO] [stderr]     30:     0x7fdfddf160b3 - __libc_start_main
[INFO] [stderr]     31:     0x559d7910f55e - _start
[INFO] [stderr]     32:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ae47a46fbcc501e249f8292f2d07d6b136c2c1361a981d1bd0890964f8ccc41d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae47a46fbcc501e249f8292f2d07d6b136c2c1361a981d1bd0890964f8ccc41d", kill_on_drop: false }`
[INFO] [stdout] ae47a46fbcc501e249f8292f2d07d6b136c2c1361a981d1bd0890964f8ccc41d