[INFO] crate wren_rust 0.1.3 is already in cache
[INFO] extracting crate wren_rust 0.1.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/wren_rust/0.1.3
[INFO] extracting crate wren_rust 0.1.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/wren_rust/0.1.3
[INFO] validating manifest of wren_rust-0.1.3 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 wren_rust-0.1.3 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 wren_rust-0.1.3
[INFO] finished frobbing wren_rust-0.1.3
[INFO] frobbed toml for wren_rust-0.1.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/wren_rust/0.1.3/Cargo.toml
[INFO] started frobbing wren_rust-0.1.3
[INFO] finished frobbing wren_rust-0.1.3
[INFO] frobbed toml for wren_rust-0.1.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/wren_rust/0.1.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 wren_rust-0.1.3 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/wren_rust/0.1.3:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 7d1096633c99fbfa3d7b452c9b8af1d63f8d4da030547f0a65eb6f81a658dcf6
[INFO] running `"docker" "start" "-a" "7d1096633c99fbfa3d7b452c9b8af1d63f8d4da030547f0a65eb6f81a658dcf6"`
[INFO] [stderr]    Compiling wren_rust v0.1.3 (/opt/crater/workdir)
[INFO] [stderr] error: failed to run custom build command for `wren_rust v0.1.3 (/opt/crater/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/crater/target/debug/build/wren_rust-d429982a681860dc/build-script-build` (exit code: 101)
[INFO] [stderr] --- stdout
[INFO] [stderr] make[1]: Entering directory '/opt/crater/workdir/wren'
[INFO] [stderr]         cc src/optional/wren_opt_meta.c    -O0 -DDEBUG -g -std=c99 -fPIC
[INFO] [stderr] util/wren.mk:199: recipe for target 'build/debug/optional/wren_opt_meta.o' failed
[INFO] [stderr] make[1]: Leaving directory '/opt/crater/workdir/wren'
[INFO] [stderr] Makefile:20: recipe for target 'debug' failed
[INFO] [stderr] 
[INFO] [stderr] --- stderr
[INFO] [stderr] mkdir: cannot create directory 'build': Read-only file system
[INFO] [stderr] make[1]: *** [build/debug/optional/wren_opt_meta.o] Error 1
[INFO] [stderr] make: *** [debug] Error 2
[INFO] [stderr] thread 'main' panicked at 'assertion failed: status.unwrap().success()', build.rs:8:5
[INFO] [stderr] stack backtrace:
[INFO] [stderr]    0:     0x55f34323a9fb - backtrace::backtrace::libunwind::trace::h5dfa5d4c5feed6dc
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
[INFO] [stderr]    1:     0x55f34323a9fb - backtrace::backtrace::trace_unsynchronized::hb731fe64f3fa469f
[INFO] [stderr]                                at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
[INFO] [stderr]    2:     0x55f34323a9fb - std::sys_common::backtrace::_print::hf4fd45fe7ae4a250
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:47
[INFO] [stderr]    3:     0x55f34323a9fb - std::sys_common::backtrace::print::h31646c3786c57441
[INFO] [stderr]                                at src/libstd/sys_common/backtrace.rs:36
[INFO] [stderr]    4:     0x55f34323a9fb - std::panicking::default_hook::{{closure}}::hda785e768c746ae7
[INFO] [stderr]                                at src/libstd/panicking.rs:200
[INFO] [stderr]    5:     0x55f34323a6d7 - std::panicking::default_hook::h0c4b76f338614ef1
[INFO] [stderr]                                at src/libstd/panicking.rs:214
[INFO] [stderr]    6:     0x55f34323b0c0 - std::panicking::rust_panic_with_hook::h096dff2cb12b67ce
[INFO] [stderr]                                at src/libstd/panicking.rs:477
[INFO] [stderr]    7:     0x55f34322f0e4 - std::panicking::begin_panic::h5c2b95867a2d1627
[INFO] [stderr]                                at /rustc/61d1607e0f6a18bb4897d6f9b10abeac9e11eb8e/src/libstd/panicking.rs:411
[INFO] [stderr]    8:     0x55f343229f90 - build_script_build::make_debug::hb2f89205373b5a20
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:8
[INFO] [stderr]    9:     0x55f34322a122 - build_script_build::main::hfb9e99d05755c83e
[INFO] [stderr]                                at /opt/crater/workdir/build.rs:27
[INFO] [stderr]   10:     0x55f3432296d0 - std::rt::lang_start::{{closure}}::h0ddf73c31ccc62ef
[INFO] [stderr]                                at /rustc/61d1607e0f6a18bb4897d6f9b10abeac9e11eb8e/src/libstd/rt.rs:64
[INFO] [stderr]   11:     0x55f34323ab13 - std::rt::lang_start_internal::{{closure}}::h055e1fdc5578d418
[INFO] [stderr]                                at src/libstd/rt.rs:49
[INFO] [stderr]   12:     0x55f34323ab13 - std::panicking::try::do_call::h480cafa68c9928b4
[INFO] [stderr]                                at src/libstd/panicking.rs:296
[INFO] [stderr]   13:     0x55f343240cda - __rust_maybe_catch_panic
[INFO] [stderr]                                at src/libpanic_unwind/lib.rs:82
[INFO] [stderr]   14:     0x55f34323b5cd - std::panicking::try::he0549d0299de204a
[INFO] [stderr]                                at src/libstd/panicking.rs:275
[INFO] [stderr]   15:     0x55f34323b5cd - std::panic::catch_unwind::h422dc2db98f03517
[INFO] [stderr]                                at src/libstd/panic.rs:394
[INFO] [stderr]   16:     0x55f34323b5cd - std::rt::lang_start_internal::h121de03325a3f900
[INFO] [stderr]                                at src/libstd/rt.rs:48
[INFO] [stderr]   17:     0x55f3432296a9 - std::rt::lang_start::h294c530aae4a075e
[INFO] [stderr]                                at /rustc/61d1607e0f6a18bb4897d6f9b10abeac9e11eb8e/src/libstd/rt.rs:64
[INFO] [stderr]   18:     0x55f34322a2ba - main
[INFO] [stderr]   19:     0x7f27925b12e1 - __libc_start_main
[INFO] [stderr]   20:     0x55f3432269ca - _start
[INFO] [stderr]   21:                0x0 - <unknown>
[INFO] [stderr] 
[INFO] running `"docker" "inspect" "7d1096633c99fbfa3d7b452c9b8af1d63f8d4da030547f0a65eb6f81a658dcf6"`
[INFO] running `"docker" "rm" "-f" "7d1096633c99fbfa3d7b452c9b8af1d63f8d4da030547f0a65eb6f81a658dcf6"`
[INFO] [stdout] 7d1096633c99fbfa3d7b452c9b8af1d63f8d4da030547f0a65eb6f81a658dcf6