[INFO] fetching crate proptest 0.10.1...
[INFO] checking proptest-0.10.1 against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] extracting crate proptest 0.10.1 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate proptest 0.10.1 on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "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-10/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" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 29c7c00d0c4defa083f71dc651ca4fcec4429c44ac702e43a8a5dde06037dfdd
[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" "29c7c00d0c4defa083f71dc651ca4fcec4429c44ac702e43a8a5dde06037dfdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29c7c00d0c4defa083f71dc651ca4fcec4429c44ac702e43a8a5dde06037dfdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29c7c00d0c4defa083f71dc651ca4fcec4429c44ac702e43a8a5dde06037dfdd", kill_on_drop: false }`
[INFO] [stdout] 29c7c00d0c4defa083f71dc651ca4fcec4429c44ac702e43a8a5dde06037dfdd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b59e2e71551307cd15eed2a14f328aa39076570c630b4ed667252d8d9120fa33
[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" "b59e2e71551307cd15eed2a14f328aa39076570c630b4ed667252d8d9120fa33", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking bit-vec v0.6.2
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking bit-set v0.5.2
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand_xorshift v0.2.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking rusty-fork v0.3.0
[INFO] [stderr]     Checking 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] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.62s
[INFO] running `Command { std: "docker" "inspect" "b59e2e71551307cd15eed2a14f328aa39076570c630b4ed667252d8d9120fa33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b59e2e71551307cd15eed2a14f328aa39076570c630b4ed667252d8d9120fa33", kill_on_drop: false }`
[INFO] [stdout] b59e2e71551307cd15eed2a14f328aa39076570c630b4ed667252d8d9120fa33