[INFO] cloning repository https://github.com/qezz/rust-ffi-demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/qezz/rust-ffi-demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqezz%2Frust-ffi-demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqezz%2Frust-ffi-demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 20254e58d38ec17be2261bc2a721bfede617e454
[INFO] testing qezz/rust-ffi-demo against master#432e145bd5a974c5b6f4dd9b352891bd7502b69d for pr-87041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqezz%2Frust-ffi-demo" "/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/qezz/rust-ffi-demo on toolchain 432e145bd5a974c5b6f4dd9b352891bd7502b69d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/qezz/rust-ffi-demo
[INFO] finished tweaking git repo https://github.com/qezz/rust-ffi-demo
[INFO] tweaked toml for git repo https://github.com/qezz/rust-ffi-demo written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/qezz/rust-ffi-demo already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71f1a8fa00870897e5b767273a304bac4f7d2df87124ccf204d2543990540611
[INFO] running `Command { std: "docker" "start" "-a" "71f1a8fa00870897e5b767273a304bac4f7d2df87124ccf204d2543990540611", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71f1a8fa00870897e5b767273a304bac4f7d2df87124ccf204d2543990540611", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71f1a8fa00870897e5b767273a304bac4f7d2df87124ccf204d2543990540611", kill_on_drop: false }`
[INFO] [stdout] 71f1a8fa00870897e5b767273a304bac4f7d2df87124ccf204d2543990540611
[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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4e0c9a21ff9b3293af33ae6f01246d07a9b98bfcb0865161c46167b3a5b5140d
[INFO] running `Command { std: "docker" "start" "-a" "4e0c9a21ff9b3293af33ae6f01246d07a9b98bfcb0865161c46167b3a5b5140d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]    Compiling cfg-if v0.1.6
[INFO] [stderr]    Compiling cc v1.0.28
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling autocfg v0.1.1
[INFO] [stderr]    Compiling failure_derive v0.1.3
[INFO] [stderr]    Compiling glob v0.2.11
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]    Compiling lazy_static v1.2.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.11
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling utf8-ranges v1.0.2
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling strsim v0.7.0
[INFO] [stderr]    Compiling bindgen v0.45.0
[INFO] [stderr]    Compiling termcolor v1.0.4
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling serde v1.0.82
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling textwrap v0.10.0
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling humantime v1.2.0
[INFO] [stderr]    Compiling regex-syntax v0.6.4
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling clang-sys v0.26.3
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling libloading v0.5.0
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling nom v4.1.1
[INFO] [stderr]    Compiling cexpr v0.3.3
[INFO] [stderr]    Compiling env_logger v0.6.0
[INFO] [stderr]    Compiling serde_json v1.0.33
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling serde_derive v1.0.82
[INFO] [stderr]    Compiling failure v0.1.3
[INFO] [stderr]    Compiling which v2.0.1
[INFO] [stderr]    Compiling rust_ffi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: constant is never used: `true_`
[INFO] [stdout]  --> /opt/rustwide/target/debug/build/rust_ffi-b73b3faf4b877e76/out/c_mx_bindings.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub const true_ : u32 = 1 ; pub const false_ : u32 = 0 ; pub const __bool_true_false_are_defined : u32 = 1 ; extern "C" { pub fn transpos...
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `false_`
[INFO] [stdout]  --> /opt/rustwide/target/debug/build/rust_ffi-b73b3faf4b877e76/out/c_mx_bindings.rs:3:29
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub const true_ : u32 = 1 ; pub const false_ : u32 = 0 ; pub const __bool_true_false_are_defined : u32 = 1 ; extern "C" { pub fn transpos...
[INFO] [stdout]   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `isEqual`
[INFO] [stdout]  --> /opt/rustwide/target/debug/build/rust_ffi-b73b3faf4b877e76/out/c_mx_bindings.rs:3:365
[INFO] [stdout]   |
[INFO] [stdout] 3 | ... } extern "C" { pub fn isEqual ( arg1 : * mut f64 , arg2 : * mut f64 , arg3 : :: std :: os :: raw :: c_int ) -> bool ; } extern "C" { ...
[INFO] [stdout]   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::env;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SubCommand`
[INFO] [stdout]  --> src/main.rs:6:22
[INFO] [stdout]   |
[INFO] [stdout] 6 | use clap::{Arg, App, SubCommand};
[INFO] [stdout]   |                      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `Value`, `json`
[INFO] [stdout]  --> src/main.rs:7:18
[INFO] [stdout]   |
[INFO] [stdout] 7 | use serde_json::{Value, Error, json};
[INFO] [stdout]   |                  ^^^^^  ^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use serde;
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `transpose`
[INFO] [stdout]   --> src/main.rs:12:16
[INFO] [stdout]    |
[INFO] [stdout] 12 | use rust_ffi::{transpose, multiply};
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/main.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn new(s: &[f64]) -> LinearMatrix {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-m64" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.rust_ffi.2778eea8-cgu.9.rcgu.o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78.h3aid1ov8h5r6zy.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "./c" "-L" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/librust_ffi-b183ef8ba34cd6b2.rlib" "/opt/rustwide/target/debug/deps/libserde_json-30d5d8b909d0bd2c.rlib" "/opt/rustwide/target/debug/deps/libryu-d0e657f5cc677ab3.rlib" "/opt/rustwide/target/debug/deps/libitoa-629fadaade644a01.rlib" "/opt/rustwide/target/debug/deps/libserde-5c295389d3a0fa78.rlib" "/opt/rustwide/target/debug/deps/libclap-305fb59a57aae514.rlib" "/opt/rustwide/target/debug/deps/libvec_map-6dd515bac74e9212.rlib" "/opt/rustwide/target/debug/deps/libtextwrap-8fbf541470ef55ec.rlib" "/opt/rustwide/target/debug/deps/libunicode_width-d258e95b9deb3cd8.rlib" "/opt/rustwide/target/debug/deps/libstrsim-c956f928dab82a0d.rlib" "/opt/rustwide/target/debug/deps/libbitflags-44f48aca50656082.rlib" "/opt/rustwide/target/debug/deps/libatty-3afb5f03de3be1b5.rlib" "/opt/rustwide/target/debug/deps/liblibc-47ac70a49eddf9d5.rlib" "/opt/rustwide/target/debug/deps/libansi_term-bd7b8ca88b2cc3f8.rlib" "-Wl,--start-group" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-37fdd654777c296f.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-d883bf2137e9181a.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-22ab8f3db88b586e.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-0167c9242d0931d5.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-361790a1a5505fc5.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-01c2ffe1ecd05a67.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-ec79e29a889fe805.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-001a3456e8a8331b.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-e8f1404290f0f040.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-76f46d0f23360a60.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-baf0bdc5eb131895.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-3a6a4ee6592d9370.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-1cc90d9dd57195f8.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-0e91863ffbec5148.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-69528f2eac185ac9.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-52d5241975807511.rlib" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-9924c22ae1efcf66.rlib" "-Wl,--end-group" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-d1241f7bd234a268.rlib" "-Wl,-Bdynamic" "-lmx" "-lutil" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/432e145bd5a974c5b6f4dd9b352891bd7502b69d/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/rust_ffi-0b1df6b4bbb41a78" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs"
[INFO] [stdout]   = note: /usr/bin/ld: cannot find -lmx
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_ffi`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "4e0c9a21ff9b3293af33ae6f01246d07a9b98bfcb0865161c46167b3a5b5140d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e0c9a21ff9b3293af33ae6f01246d07a9b98bfcb0865161c46167b3a5b5140d", kill_on_drop: false }`
[INFO] [stdout] 4e0c9a21ff9b3293af33ae6f01246d07a9b98bfcb0865161c46167b3a5b5140d