[INFO] cloning repository https://github.com/mikeycgto/ruru-rstring-encoding
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mikeycgto/ruru-rstring-encoding" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmikeycgto%2Fruru-rstring-encoding", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmikeycgto%2Fruru-rstring-encoding'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 580edf61e9c0942706726a4bd3b5cfa2c62b2520
[INFO] testing mikeycgto/ruru-rstring-encoding against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmikeycgto%2Fruru-rstring-encoding" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mikeycgto/ruru-rstring-encoding on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mikeycgto/ruru-rstring-encoding
[INFO] finished tweaking git repo https://github.com/mikeycgto/ruru-rstring-encoding
[INFO] tweaked toml for git repo https://github.com/mikeycgto/ruru-rstring-encoding written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/mikeycgto/ruru-rstring-encoding already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d2d100d8c31fd09eb7e3c7c477c95acf8a058403463f7d63cb7e499da13bd68a
[INFO] running `Command { std: "docker" "start" "-a" "d2d100d8c31fd09eb7e3c7c477c95acf8a058403463f7d63cb7e499da13bd68a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2d100d8c31fd09eb7e3c7c477c95acf8a058403463f7d63cb7e499da13bd68a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2d100d8c31fd09eb7e3c7c477c95acf8a058403463f7d63cb7e499da13bd68a", kill_on_drop: false }`
[INFO] [stdout] d2d100d8c31fd09eb7e3c7c477c95acf8a058403463f7d63cb7e499da13bd68a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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=warn" "-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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5aa49177c4717f8d0525ccf290eed732bc9b4203006c7e7026cf6897dc01df3d
[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" "5aa49177c4717f8d0525ccf290eed732bc9b4203006c7e7026cf6897dc01df3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruby-sys v0.2.20
[INFO] [stderr]    Compiling libc v0.2.20
[INFO] [stderr]    Compiling lazy_static v0.2.2
[INFO] [stderr]    Compiling ruru v0.9.3
[INFO] [stderr]    Compiling ruru-rstring-encoding v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `StringTest`, which is not FFI-safe
[INFO] [stdout]  --> src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     StringTest,
[INFO] [stdout]   |     ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]   = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]   = note: this struct has unspecified layout
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | class!(StringTest);
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit code: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/opt/rustwide/rustup-home/toolchains/1.49.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/ruru_rstring_encoding.ruru_rstring_encoding.6bttikwg-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/ruru_rstring_encoding.ruru_rstring_encoding.6bttikwg-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/ruru_rstring_encoding.ruru_rstring_encoding.6bttikwg-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/ruru_rstring_encoding.ruru_rstring_encoding.6bttikwg-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/ruru_rstring_encoding.ruru_rstring_encoding.6bttikwg-cgu.4.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/libruru_rstring_encoding.so" "-Wl,--version-script=/tmp/rustcvRV0uZ/list" "/opt/rustwide/target/debug/deps/ruru_rstring_encoding.3fls2zr0q9ji5af3.rcgu.o" "/opt/rustwide/target/debug/deps/ruru_rstring_encoding.u5uxsqe3micgw3a.rcgu.o" "-shared" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/usr/lib" "-L" "/opt/rustwide/rustup-home/toolchains/1.49.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libruru-9d53343dc9185e0a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libruby_sys-7e586b7f580ec10c.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/liblibc-014226c4f3e04892.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/liblazy_static-bb5cd3c8ae54f9d2.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libstd-e12de7683a34c500.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libpanic_unwind-446a53c2e468675f.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libminiz_oxide-86fef9fb252a2d33.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libadler-3bed9bfd30304751.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libobject-0e38eeb474a7b386.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libaddr2line-a846ed547b824740.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libgimli-c9540f0a4fb9265d.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/librustc_demangle-7d2ca66c92c356eb.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libhashbrown-147e2c808f949493.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/librustc_std_workspace_alloc-bd2a4369506670e9.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libunwind-74bfdd0ce7d0ed48.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libcfg_if-6777f47f1c491841.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/liblibc-b104f1790174f2be.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/liballoc-db37898996f45c13.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/librustc_std_workspace_core-25b7435131fc4938.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcvRV0uZ/libcore-9d4b6f3c097e876e.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/tmp/rustcvRV0uZ/libcompiler_builtins-3f953ad652ab829a.rlib" "-Wl,-Bdynamic" "-lruby-2.7" "-lutil" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc"
[INFO] [stdout]   = note: /usr/bin/ld: cannot find -lruby-2.7
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ruru-rstring-encoding`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "5aa49177c4717f8d0525ccf290eed732bc9b4203006c7e7026cf6897dc01df3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5aa49177c4717f8d0525ccf290eed732bc9b4203006c7e7026cf6897dc01df3d", kill_on_drop: false }`
[INFO] [stdout] 5aa49177c4717f8d0525ccf290eed732bc9b4203006c7e7026cf6897dc01df3d