[INFO] fetching crate proptest 0.10.1...
[INFO] testing proptest-0.10.1 against try#eafdee2dfae8c2233b74f98b123308be7ccefcc6 for pr-79296
[INFO] extracting crate proptest 0.10.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate proptest 0.10.1 on toolchain eafdee2dfae8c2233b74f98b123308be7ccefcc6
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate proptest 0.10.1
[INFO] finished tweaking crates.io crate proptest 0.10.1
[INFO] tweaked toml for crates.io crate proptest 0.10.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate proptest 0.10.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded regex v1.3.9
[INFO] [stderr]   Downloaded cc v1.0.58
[INFO] [stderr]   Downloaded lazy_static v1.4.0
[INFO] [stderr]   Downloaded remove_dir_all v0.5.3
[INFO] [stderr]   Downloaded num-traits v0.2.12
[INFO] [stderr]   Downloaded wasi v0.9.0+wasi-snapshot-preview1
[INFO] [stderr]   Downloaded autocfg v1.0.0
[INFO] [stderr]   Downloaded bit-set v0.5.2
[INFO] [stderr]   Downloaded rand_xorshift v0.2.0
[INFO] [stderr]   Downloaded rand_chacha v0.2.2
[INFO] [stderr]   Downloaded redox_syscall v0.1.57
[INFO] [stderr]   Downloaded thread_local v1.0.1
[INFO] [stderr]   Downloaded fnv v1.0.7
[INFO] [stderr]   Downloaded byteorder v1.3.4
[INFO] [stderr]   Downloaded bit-vec v0.6.2
[INFO] [stderr]   Downloaded rand v0.7.3
[INFO] [stderr]   Downloaded bitflags v1.2.1
[INFO] [stderr]   Downloaded memchr v2.3.3
[INFO] [stderr]   Downloaded getrandom v0.1.14
[INFO] [stderr]   Downloaded wait-timeout v0.2.0
[INFO] [stderr]   Downloaded rusty-fork v0.3.0
[INFO] [stderr]   Downloaded aho-corasick v0.7.13
[INFO] [stderr]   Downloaded rand_core v0.5.1
[INFO] [stderr]   Downloaded quick-error v1.2.3
[INFO] [stderr]   Downloaded rand_hc v0.2.0
[INFO] [stderr]   Downloaded semver v0.9.0
[INFO] [stderr]   Downloaded libc v0.2.74
[INFO] [stderr]   Downloaded bit_field v0.10.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.18
[INFO] [stderr]   Downloaded raw-cpuid v8.0.0
[INFO] [stderr]   Downloaded tempfile v3.1.0
[INFO] [stderr]   Downloaded rustc_version v0.2.3
[INFO] [stderr]   Downloaded x86 v0.33.0
[INFO] [stderr]   Downloaded cfg-if v0.1.10
[INFO] [stderr]   Downloaded semver-parser v0.7.0
[INFO] [stderr]   Downloaded winapi v0.3.9
[INFO] [stderr]   Downloaded winapi-i686-pc-windows-gnu v0.4.0
[INFO] [stderr]   Downloaded winapi-x86_64-pc-windows-gnu v0.4.0
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c142ad1872f480b2719e8b8a739d32ee6ee3344e1983bd7b83973163b8a9ceb4
[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" "c142ad1872f480b2719e8b8a739d32ee6ee3344e1983bd7b83973163b8a9ceb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c142ad1872f480b2719e8b8a739d32ee6ee3344e1983bd7b83973163b8a9ceb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c142ad1872f480b2719e8b8a739d32ee6ee3344e1983bd7b83973163b8a9ceb4", kill_on_drop: false }`
[INFO] [stdout] c142ad1872f480b2719e8b8a739d32ee6ee3344e1983bd7b83973163b8a9ceb4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 428b319c3b79b2b2208bd71ee0f9904eef1c3577ae082da904f4cfd23cda26b0
[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" "428b319c3b79b2b2208bd71ee0f9904eef1c3577ae082da904f4cfd23cda26b0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling quick-error v1.2.3
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_xorshift v0.2.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling rusty-fork v0.3.0
[INFO] [stderr]    Compiling proptest v0.10.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 25.70s
[INFO] running `Command { std: "docker" "inspect" "428b319c3b79b2b2208bd71ee0f9904eef1c3577ae082da904f4cfd23cda26b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "428b319c3b79b2b2208bd71ee0f9904eef1c3577ae082da904f4cfd23cda26b0", kill_on_drop: false }`
[INFO] [stdout] 428b319c3b79b2b2208bd71ee0f9904eef1c3577ae082da904f4cfd23cda26b0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8ce3bb4e727d1842f0cd7e5f9d721e6ec5881e87828fc1409c8e4730f31d7394
[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" "8ce3bb4e727d1842f0cd7e5f9d721e6ec5881e87828fc1409c8e4730f31d7394", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling aho-corasick v0.7.13
[INFO] [stderr]    Compiling regex v1.3.9
[INFO] [stderr]    Compiling proptest v0.10.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` fn uses type `impl strategy::traits::Strategy`, which is not FFI-safe
[INFO] [stdout]     --> src/sugar.rs:618:21
[INFO] [stdout]      |
[INFO] [stdout] 618  |                    -> impl $crate::strategy::Strategy<Value = $return_type> {
[INFO] [stdout]      |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout] ...
[INFO] [stdout] 1170 | /     prop_compose! {
[INFO] [stdout] 1171 | |         /// These are docs!
[INFO] [stdout] 1172 | |         #[allow(dead_code)]
[INFO] [stdout] 1173 | |         pub [extern "C"] fn two_ints_pub_with_attrs
[INFO] [stdout] ...    |
[INFO] [stdout] 1178 | |         }
[INFO] [stdout] 1179 | |     }
[INFO] [stdout]      | |_____- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]      = note: opaque types have no C equivalent
[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] warning: `extern` fn uses type `impl strategy::traits::Strategy`, which is not FFI-safe
[INFO] [stdout]     --> src/sugar.rs:618:21
[INFO] [stdout]      |
[INFO] [stdout] 618  |                    -> impl $crate::strategy::Strategy<Value = $return_type> {
[INFO] [stdout]      |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout] ...
[INFO] [stdout] 1181 | /     prop_compose! {
[INFO] [stdout] 1182 | |         // The only modifier we can usefully put here is "unsafe", but we want
[INFO] [stdout] 1183 | |         // to keep this crate unsafe-free, even nominally. "const" may
[INFO] [stdout] 1184 | |         // eventually work, but is not allowed right now since the generated
[INFO] [stdout] ...    |
[INFO] [stdout] 1190 | |         }
[INFO] [stdout] 1191 | |     }
[INFO] [stdout]      | |_____- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: opaque types have no C equivalent
[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] [stderr] error: could not compile `proptest`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name proptest --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --test --cfg 'feature="bit-set"' --cfg 'feature="break-dead-code"' --cfg 'feature="default"' --cfg 'feature="fork"' --cfg 'feature="lazy_static"' --cfg 'feature="quick-error"' --cfg 'feature="regex-syntax"' --cfg 'feature="rusty-fork"' --cfg 'feature="std"' --cfg 'feature="tempfile"' --cfg 'feature="timeout"' -C metadata=e06d012dd7244d0e -C extra-filename=-e06d012dd7244d0e --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern bit_set=/opt/rustwide/target/debug/deps/libbit_set-d49ad8eef397c3a4.rlib --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-df474a8ca45884a8.rlib --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-cf2f15db13ed7d55.rlib --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-cd2401a06b1676f6.rlib --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-b6bd9da51231e247.rlib --extern quick_error=/opt/rustwide/target/debug/deps/libquick_error-dac6356ab0901515.rlib --extern rand=/opt/rustwide/target/debug/deps/librand-37d6f2e5d64625da.rlib --extern rand_chacha=/opt/rustwide/target/debug/deps/librand_chacha-1b13c5bff9db4f6b.rlib --extern rand_xorshift=/opt/rustwide/target/debug/deps/librand_xorshift-6839b276dc9a913a.rlib --extern regex=/opt/rustwide/target/debug/deps/libregex-9fca807dbf6037c4.rlib --extern regex_syntax=/opt/rustwide/target/debug/deps/libregex_syntax-f58e76f38029c5ae.rlib --extern rusty_fork=/opt/rustwide/target/debug/deps/librusty_fork-18b0958f67488ffc.rlib --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-ef66217d6ff21857.rlib --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "8ce3bb4e727d1842f0cd7e5f9d721e6ec5881e87828fc1409c8e4730f31d7394", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ce3bb4e727d1842f0cd7e5f9d721e6ec5881e87828fc1409c8e4730f31d7394", kill_on_drop: false }`
[INFO] [stdout] 8ce3bb4e727d1842f0cd7e5f9d721e6ec5881e87828fc1409c8e4730f31d7394