[INFO] updating cached repository dodecaphonic/rust_ffi_example
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dodecaphonic/rust_ffi_example
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dodecaphonic/rust_ffi_example" "work/ex/beta-1.37-6/sources/1.36.0/gh/dodecaphonic/rust_ffi_example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/dodecaphonic/rust_ffi_example'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dodecaphonic/rust_ffi_example" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dodecaphonic/rust_ffi_example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dodecaphonic/rust_ffi_example'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 73a1c32ee74f0848947012a1fdf456c29367a2b1
[INFO] sha for GitHub repo dodecaphonic/rust_ffi_example: 73a1c32ee74f0848947012a1fdf456c29367a2b1
[INFO] validating manifest of dodecaphonic/rust_ffi_example on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of dodecaphonic/rust_ffi_example on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing dodecaphonic/rust_ffi_example
[INFO] finished frobbing dodecaphonic/rust_ffi_example
[INFO] frobbed toml for dodecaphonic/rust_ffi_example written to work/ex/beta-1.37-6/sources/1.36.0/gh/dodecaphonic/rust_ffi_example/Cargo.toml
[INFO] started frobbing dodecaphonic/rust_ffi_example
[INFO] finished frobbing dodecaphonic/rust_ffi_example
[INFO] frobbed toml for dodecaphonic/rust_ffi_example written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dodecaphonic/rust_ffi_example/Cargo.toml
[INFO] crate dodecaphonic/rust_ffi_example already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dodecaphonic/rust_ffi_example against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/dodecaphonic/rust_ffi_example:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 9aae90d83eece187b8801dae508c8c15f794e0dbdf67c1ad21d8b293beffed47
[INFO] running `"docker" "start" "-a" "9aae90d83eece187b8801dae508c8c15f794e0dbdf67c1ad21d8b293beffed47"`
[INFO] [stderr]    Compiling rust_ffi_example v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error: linking with `cc` failed: exit code: 1
[INFO] [stderr]   |
[INFO] [stderr]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.0.rcgu.o" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.1.rcgu.o" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.2.rcgu.o" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.3.rcgu.o" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.4.rcgu.o" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.5.rcgu.o" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.6.rcgu.o" "-o" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb" "/opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.2yckcmxlfhg6o2d5.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/crater/target/debug/deps" "-L" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-lmagic" "-Wl,--start-group" "-Wl,-Bstatic" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-9895e8982b0a79e7.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-57306b8ed3378a0e.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-54463ae5adae3649.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-d99667b199a9875a.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-51f4300e102199f5.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-b3ccf1f7737a6a91.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-157c37a3ceb78853.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-505bcee45aafb736.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-c29abd529ba4452b.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-895383a3232f6572.rlib" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-5594cb4f559bc761.rlib" "-Wl,--end-group" "/opt/crater/rustup-home/toolchains/1.36.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-38e90baf978bc428.rlib" "-Wl,-Bdynamic" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
[INFO] [stderr]   = note: /opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.1.rcgu.o: In function `rust_ffi_example::magic::pow':
[INFO] [stderr]           /opt/crater/workdir/src/main.rs:18: undefined reference to `magic_pow'
[INFO] [stderr]           /opt/crater/target/debug/deps/rust_ffi_example-9f2ac832ce5f9fcb.rust_ffi_example.bqak8cc6-cgu.1.rcgu.o: In function `rust_ffi_example::magic::multiply':
[INFO] [stderr]           /opt/crater/workdir/src/main.rs:24: undefined reference to `magic_multiply'
[INFO] [stderr]           collect2: error: ld returned 1 exit status
[INFO] [stderr]           
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust_ffi_example`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9aae90d83eece187b8801dae508c8c15f794e0dbdf67c1ad21d8b293beffed47"`
[INFO] running `"docker" "rm" "-f" "9aae90d83eece187b8801dae508c8c15f794e0dbdf67c1ad21d8b293beffed47"`
[INFO] [stdout] 9aae90d83eece187b8801dae508c8c15f794e0dbdf67c1ad21d8b293beffed47