[INFO] cloning repository https://github.com/HugoKempfer/knn-recommender
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/HugoKempfer/knn-recommender" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHugoKempfer%2Fknn-recommender", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHugoKempfer%2Fknn-recommender'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4b10654bc61b6ab218d76df07eb726f03f244cd7
[INFO] checking HugoKempfer/knn-recommender against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHugoKempfer%2Fknn-recommender" "/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/HugoKempfer/knn-recommender on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/HugoKempfer/knn-recommender
[INFO] finished tweaking git repo https://github.com/HugoKempfer/knn-recommender
[INFO] tweaked toml for git repo https://github.com/HugoKempfer/knn-recommender written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/HugoKempfer/knn-recommender already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 903fecc71c7915c9f2fab4da7d1533292e4d7028d0955f0e90012997778315c4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "903fecc71c7915c9f2fab4da7d1533292e4d7028d0955f0e90012997778315c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "903fecc71c7915c9f2fab4da7d1533292e4d7028d0955f0e90012997778315c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "903fecc71c7915c9f2fab4da7d1533292e4d7028d0955f0e90012997778315c4", kill_on_drop: false }`
[INFO] [stdout] 903fecc71c7915c9f2fab4da7d1533292e4d7028d0955f0e90012997778315c4
[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" "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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8650d6e7b6a58de15d962a87898a3df66d3bcfa7142d6863974108c124be0cea
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8650d6e7b6a58de15d962a87898a3df66d3bcfa7142d6863974108c124be0cea", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking regex-syntax v0.3.9
[INFO] [stderr]    Compiling rustml v0.0.7
[INFO] [stderr]     Checking utf8-ranges v0.1.3
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking memchr v0.1.11
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking aho-corasick v0.5.3
[INFO] [stderr] error: failed to run custom build command for `rustml v0.0.7`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/rustml-32555d55575fab5d/build-script-build` (exit status: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   /usr/bin/ld: cannot find -lopencv_highgui
[INFO] [stderr]   collect2: error: ld returned 1 exit status
[INFO] [stderr]   thread 'main' panicked at '
[INFO] [stderr] 
[INFO] [stderr]   OpenCV not found. On Ubuntu try 'sudo apt-get install libopencv-highgui-dev' before continuing.', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustml-0.0.7/build.rs:25:5
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x5646fd73c890 - std::backtrace_rs::backtrace::libunwind::trace::h706b838f5bbd876b
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
[INFO] [stderr]      1:     0x5646fd73c890 - std::backtrace_rs::backtrace::trace_unsynchronized::hc15f29ae7822b7b8
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x5646fd73c890 - std::sys_common::backtrace::_print_fmt::h7c580c971f91926c
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x5646fd73c890 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2a772198c4032452
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]      4:     0x5646fd7595dc - core::fmt::write::h9a6d9c74526a6c1b
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/core/src/fmt/mod.rs:1115:17
[INFO] [stderr]      5:     0x5646fd73ae95 - std::io::Write::write_fmt::h00f38d9eb2c32e02
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/io/mod.rs:1663:15
[INFO] [stderr]      6:     0x5646fd73e4eb - std::sys_common::backtrace::_print::h5b3c171e6f864ae4
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]      7:     0x5646fd73e4eb - std::sys_common::backtrace::print::h93b9e9ed2a98e611
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]      8:     0x5646fd73e4eb - std::panicking::default_hook::{{closure}}::hd8da92bb68d520c5
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:208:50
[INFO] [stderr]      9:     0x5646fd73dfc1 - std::panicking::default_hook::hdbc8b2951c5afbab
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:225:9
[INFO] [stderr]     10:     0x5646fd73ebb4 - std::panicking::rust_panic_with_hook::h8a4c841655926f4e
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:622:17
[INFO] [stderr]     11:     0x5646fd72760f - std::panicking::begin_panic::{{closure}}::hc108ee67165ee5cf
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:542:9
[INFO] [stderr]     12:     0x5646fd72743e - std::sys_common::backtrace::__rust_end_short_backtrace::h4021e708864ea903
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]     13:     0x5646fd727517 - std::panicking::begin_panic::hc54a8def818178d6
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:541:12
[INFO] [stderr]     14:     0x5646fd72932f - build_script_build::try_gcc::h7bca72b0bcd50cf2
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustml-0.0.7/build.rs:25:5
[INFO] [stderr]     15:     0x5646fd7293bb - build_script_build::main::h1ad57275c90ef291
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustml-0.0.7/build.rs:30:5
[INFO] [stderr]     16:     0x5646fd72484b - core::ops::function::FnOnce::call_once::heb3a94ba367570ae
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     17:     0x5646fd72747e - std::sys_common::backtrace::__rust_begin_short_backtrace::h5e7da2a4cc2a98e4
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stderr]     18:     0x5646fd723dd1 - std::rt::lang_start::{{closure}}::heb81411006825402
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/rt.rs:63:18
[INFO] [stderr]     19:     0x5646fd73f0ba - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hcbe5785d54a49ce2
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     20:     0x5646fd73f0ba - std::panicking::try::do_call::h1c15e7ee8563c29d
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:401:40
[INFO] [stderr]     21:     0x5646fd73f0ba - std::panicking::try::hb8b07cef009cb4fc
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:365:19
[INFO] [stderr]     22:     0x5646fd73f0ba - std::panic::catch_unwind::h65a8efbe596bcbb1
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panic.rs:434:14
[INFO] [stderr]     23:     0x5646fd73f0ba - std::rt::lang_start_internal::{{closure}}::h66ded7ab0f18e9fb
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/rt.rs:45:48
[INFO] [stderr]     24:     0x5646fd73f0ba - std::panicking::try::do_call::h29cafa65efb3f3f3
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:401:40
[INFO] [stderr]     25:     0x5646fd73f0ba - std::panicking::try::h412fc5378b4dbfc4
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panicking.rs:365:19
[INFO] [stderr]     26:     0x5646fd73f0ba - std::panic::catch_unwind::h555def6aac5bf192
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/panic.rs:434:14
[INFO] [stderr]     27:     0x5646fd73f0ba - std::rt::lang_start_internal::hfff48202d7fee6e3
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/rt.rs:45:20
[INFO] [stderr]     28:     0x5646fd723da0 - std::rt::lang_start::hf6ff3b8e25203ccc
[INFO] [stderr]                                  at /rustc/dfd7b8d03fb93d0e03147d28b3be6d93260fa94d/library/std/src/rt.rs:62:5
[INFO] [stderr]     29:     0x5646fd72941c - main
[INFO] [stderr]     30:     0x7f9a299290b3 - __libc_start_main
[INFO] [stderr]     31:     0x5646fd72079e - _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" "8650d6e7b6a58de15d962a87898a3df66d3bcfa7142d6863974108c124be0cea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8650d6e7b6a58de15d962a87898a3df66d3bcfa7142d6863974108c124be0cea", kill_on_drop: false }`
[INFO] [stdout] 8650d6e7b6a58de15d962a87898a3df66d3bcfa7142d6863974108c124be0cea