[INFO] crate classgroup 0.1.0 is already in cache
[INFO] extracting crate classgroup 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/classgroup/0.1.0
[INFO] extracting crate classgroup 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/classgroup/0.1.0
[INFO] validating manifest of classgroup-0.1.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of classgroup-0.1.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing classgroup-0.1.0
[INFO] finished frobbing classgroup-0.1.0
[INFO] frobbed toml for classgroup-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/classgroup/0.1.0/Cargo.toml
[INFO] started frobbing classgroup-0.1.0
[INFO] finished frobbing classgroup-0.1.0
[INFO] frobbed toml for classgroup-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/classgroup/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing classgroup-0.1.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/classgroup/0.1.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] fbb3dea353ea4f6632ee535c43c65b252dbfe470a6d5330fdcfa6149f8ef987c
[INFO] running `"docker" "start" "-a" "fbb3dea353ea4f6632ee535c43c65b252dbfe470a6d5330fdcfa6149f8ef987c"`
[INFO] [stderr]    Compiling classgroup v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/gmp/mpz.rs:487:40
[INFO] [stderr]     |
[INFO] [stderr] 487 |     fn cause(&self) -> Option<&'static Error> {
[INFO] [stderr]     |                                        ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.49s
[INFO] running `"docker" "inspect" "fbb3dea353ea4f6632ee535c43c65b252dbfe470a6d5330fdcfa6149f8ef987c"`
[INFO] running `"docker" "rm" "-f" "fbb3dea353ea4f6632ee535c43c65b252dbfe470a6d5330fdcfa6149f8ef987c"`
[INFO] [stdout] fbb3dea353ea4f6632ee535c43c65b252dbfe470a6d5330fdcfa6149f8ef987c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/classgroup/0.1.0:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 5d501bae94bc7ce9af58df21cfa8010ea7d5c72544dde7d66a2f546d09f04d1a
[INFO] running `"docker" "start" "-a" "5d501bae94bc7ce9af58df21cfa8010ea7d5c72544dde7d66a2f546d09f04d1a"`
[INFO] [stderr]    Compiling cast v0.2.2
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling regex-automata v0.1.8
[INFO] [stderr]    Compiling rand_xoshiro v0.1.0
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling tinytemplate v1.0.2
[INFO] [stderr]    Compiling criterion-plot v0.3.1
[INFO] [stderr]    Compiling csv-core v0.1.6
[INFO] [stderr]    Compiling bstr v0.2.7
[INFO] [stderr]    Compiling csv v1.1.1
[INFO] [stderr]    Compiling criterion v0.2.11
[INFO] [stderr]    Compiling classgroup v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/gmp/mpz.rs:487:40
[INFO] [stderr]     |
[INFO] [stderr] 487 |     fn cause(&self) -> Option<&'static Error> {
[INFO] [stderr]     |                                        ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[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/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.0.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.1.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.10.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.11.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.12.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.13.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.14.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.15.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.2.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.3.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.4.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.5.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.6.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.7.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.8.rcgu.o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.classgroup.c8r9g27x-cgu.9.rcgu.o" "-o" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c" "/opt/crater/target/debug/deps/classgroup-d6ceeb0fcd7d064c.2xzahritty1sdb2i.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/crater/target/debug/deps" "-L" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-lgmp" "-lgmp" "-lgmp" "-lgmp" "-Wl,-Bstatic" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-0127509d2e54a846.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libterm-2651f8b4eed9e86e.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-c729851ce6e3efb2.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-e8235f0d435d4737.rlib" "/opt/crater/target/debug/deps/libnum_traits-d11dcc7883adaecb.rlib" "/opt/crater/target/debug/deps/liblibc-d019039477cac03b.rlib" "-Wl,--start-group" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-4a76ff35a356aedf.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-e11c7b3b3225afe2.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-13217ede3d276f16.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-621a9ee22da6caa1.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-546c844e8071bbeb.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-be9569e4d599746f.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-47d8845cef2a3bc5.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-017511bce73a530c.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-be7979c57a08057b.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-d6459c4f0817c67c.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-580035dd98451925.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-aee5c24fff305dea.rlib" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-8a55a4098920125a.rlib" "-Wl,--end-group" "/opt/crater/rustup-home/toolchains/1.37.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-9fc4b5be2ba5cc19.rlib" "-Wl,-Bdynamic" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
[INFO] [stderr]   = note: /usr/bin/ld: cannot find -lgmp
[INFO] [stderr]           /usr/bin/ld: cannot find -lgmp
[INFO] [stderr]           /usr/bin/ld: cannot find -lgmp
[INFO] [stderr]           /usr/bin/ld: cannot find -lgmp
[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 `classgroup`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5d501bae94bc7ce9af58df21cfa8010ea7d5c72544dde7d66a2f546d09f04d1a"`
[INFO] running `"docker" "rm" "-f" "5d501bae94bc7ce9af58df21cfa8010ea7d5c72544dde7d66a2f546d09f04d1a"`
[INFO] [stdout] 5d501bae94bc7ce9af58df21cfa8010ea7d5c72544dde7d66a2f546d09f04d1a