[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 master#5d5ff84130da0d74c6ece368dbe821d8f83fa526 for pr-79296
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmikeycgto%2Fruru-rstring-encoding" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mikeycgto/ruru-rstring-encoding on toolchain 5d5ff84130da0d74c6ece368dbe821d8f83fa526
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "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-5/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" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "fetch" "--locked" "--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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07eb3682661717042f558ebba67532d21cbed52e99e5d5e3e997c1f8b9da15c4
[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" "07eb3682661717042f558ebba67532d21cbed52e99e5d5e3e997c1f8b9da15c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07eb3682661717042f558ebba67532d21cbed52e99e5d5e3e997c1f8b9da15c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07eb3682661717042f558ebba67532d21cbed52e99e5d5e3e997c1f8b9da15c4", kill_on_drop: false }`
[INFO] [stdout] 07eb3682661717042f558ebba67532d21cbed52e99e5d5e3e997c1f8b9da15c4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+5d5ff84130da0d74c6ece368dbe821d8f83fa526" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 782c1d405552e5b0a18db13b4ed7559869cc89c01985ee487d8633bb4114427f
[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" "782c1d405552e5b0a18db13b4ed7559869cc89c01985ee487d8633bb4114427f", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruby-sys v0.2.20
[INFO] [stderr]    Compiling libc v0.2.20
[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/5d5ff84130da0d74c6ece368dbe821d8f83fa526/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/rustcbmHO9R/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/5d5ff84130da0d74c6ece368dbe821d8f83fa526/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libruru-1a533307bcf856ab.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libruby_sys-fa0afa9d8c7f5b26.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/liblibc-508a9d3ea83be361.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/liblazy_static-2be739f272ebf2b4.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libstd-c659455244c9d2ca.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libpanic_unwind-448643d99e633b5d.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libminiz_oxide-c7c3d631a525883a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libadler-d7659a11bb201e01.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libobject-9aceb6f83a33a9b6.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libaddr2line-876c3057c8a2a7c2.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libgimli-2f02aa3e24d2aa49.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/librustc_demangle-1d4694108f8cb543.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libhashbrown-79eaa6e630880f50.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/librustc_std_workspace_alloc-0df1a4ec96f80cf7.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libunwind-bba9b0f0f4d77257.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libcfg_if-f848f9c987265235.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/liblibc-0d5ea4f2d39b8e27.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/liballoc-c22053fa5fc00a3b.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/librustc_std_workspace_core-c52e5d6301e1bd59.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcbmHO9R/libcore-2675a9a46b5cec89.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/tmp/rustcbmHO9R/libcompiler_builtins-6e3d052afeb9f711.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" "782c1d405552e5b0a18db13b4ed7559869cc89c01985ee487d8633bb4114427f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "782c1d405552e5b0a18db13b4ed7559869cc89c01985ee487d8633bb4114427f", kill_on_drop: false }`
[INFO] [stdout] 782c1d405552e5b0a18db13b4ed7559869cc89c01985ee487d8633bb4114427f