[INFO] fetching crate proptest 0.10.1...
[INFO] checking proptest-0.10.1 against master#d62d3f7fa9a91d933213cc10e20e740608983f64 for pr-77015
[INFO] extracting crate proptest 0.10.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate proptest 0.10.1 on toolchain d62d3f7fa9a91d933213cc10e20e740608983f64
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "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-9/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" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff4759bae4b24da94f2c4c305d1eadd8ed3af45fc2cdfc096232adb5932094c5
[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" "ff4759bae4b24da94f2c4c305d1eadd8ed3af45fc2cdfc096232adb5932094c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff4759bae4b24da94f2c4c305d1eadd8ed3af45fc2cdfc096232adb5932094c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff4759bae4b24da94f2c4c305d1eadd8ed3af45fc2cdfc096232adb5932094c5", kill_on_drop: false }`
[INFO] [stdout] ff4759bae4b24da94f2c4c305d1eadd8ed3af45fc2cdfc096232adb5932094c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+d62d3f7fa9a91d933213cc10e20e740608983f64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 00cebf31916150d6798cc80b63e26fa4a0c1e0b85c579f1df8878e70287c271f
[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" "00cebf31916150d6798cc80b63e26fa4a0c1e0b85c579f1df8878e70287c271f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking aho-corasick v0.7.13
[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 regex v1.3.9
[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 26.30s
[INFO] running `Command { std: "docker" "inspect" "00cebf31916150d6798cc80b63e26fa4a0c1e0b85c579f1df8878e70287c271f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00cebf31916150d6798cc80b63e26fa4a0c1e0b85c579f1df8878e70287c271f", kill_on_drop: false }`
[INFO] [stdout] 00cebf31916150d6798cc80b63e26fa4a0c1e0b85c579f1df8878e70287c271f